core/services/fluxmonitorv2: fix TestFluxMonitor_Deviation race

[jmank88]

Go-ethereum mutates *big.Ints passed to ABI bindings for some reason. This may be a bug/oversight, but in any case leads to a race between tests:

• https://github.com/ethereum/go-ethereum/blob/master/accounts/abi/topics.go#L44-L45
• https://github.com/ethereum/go-ethereum/blob/master/common/math/big.go#L176-L177
• https://cs.opensource.google/go/go/+/refs/tags/go1.23.3:src/math/big/int.go;l=1170-1171

Race:

==================
WARNING: DATA RACE
Read at 0x00c0010982c0 by goroutine 344:
  reflect.Value.Bool()
      /opt/hostedtoolcache/go/1.23.3/x64/src/reflect/value.go:283 +0x493
  reflect.deepValueEqual()
      /opt/hostedtoolcache/go/1.23.3/x64/src/reflect/deepequal.go:167 +0x494
  reflect.deepValueEqual()
      /opt/hostedtoolcache/go/1.23.3/x64/src/reflect/deepequal.go:130 +0x1dfb
  reflect.deepValueEqual()
      /opt/hostedtoolcache/go/1.23.3/x64/src/reflect/deepequal.go:127 +0x1689
  reflect.DeepEqual()
      /opt/hostedtoolcache/go/1.23.3/x64/src/reflect/deepequal.go:238 +0x244
  github.com/stretchr/testify/assert.ObjectsAreEqual()
      /home/runner/go/pkg/mod/github.com/stretchr/testify@v1.9.0/assert/assertions.go:65 +0x[17](https://github.com/smartcontractkit/chainlink/actions/runs/11940570982/job/33283529603#step:19:18)2
  github.com/stretchr/testify/assert.Equal()
      /home/runner/go/pkg/mod/github.com/stretchr/testify@v1.9.0/assert/assertions.go:463 +0x237
  github.com/stretchr/testify/require.Equal()
      /home/runner/go/pkg/mod/github.com/stretchr/testify@v1.9.0/require/require.go:159 +0xe7
  github.com/smartcontractkit/chainlink/v2/core/services/fluxmonitorv2_test.setupFluxAggregatorUniverse()
      /home/runner/work/chainlink/chainlink/core/services/fluxmonitorv2/integrations_test.go:175 +0x1407
  github.com/smartcontractkit/chainlink/v2/core/services/fluxmonitorv2_test.TestFluxMonitor_Deviation.func1()
      /home/runner/work/chainlink/chainlink/core/services/fluxmonitorv2/integrations_test.go:445 +0x7a
  testing.tRunner()
      /opt/hostedtoolcache/go/1.23.3/x64/src/testing/testing.go:1690 +0x226
  testing.(*T).Run.gowrap1()
      /opt/hostedtoolcache/go/1.23.3/x64/src/testing/testing.go:1743 +0x44

Previous write at 0x00c0010982c0 by goroutine 343:
  math/big.(*Int).And()
      /opt/hostedtoolcache/go/1.23.3/x64/src/math/big/int.go:1[18](https://github.com/smartcontractkit/chainlink/actions/runs/11940570982/job/33283529603#step:19:19)4 +0x4ce
  github.com/ethereum/go-ethereum/common/math.U256()
      /home/runner/go/pkg/mod/github.com/ethereum/go-ethereum@v1.14.11/common/math/big.go:229 +0x3c
  github.com/ethereum/go-ethereum/common/math.U256Bytes()
      /home/runner/go/pkg/mod/github.com/ethereum/go-ethereum@v1.14.11/common/math/big.go:235 +0xe
  github.com/ethereum/go-ethereum/accounts/abi.MakeTopics()
      /home/runner/go/pkg/mod/github.com/ethereum/go-ethereum@v1.14.11/accounts/abi/topics.go:45 +0xbcc
  github.com/ethereum/go-ethereum/accounts/abi/bind.(*BoundContract).FilterLogs()
      /home/runner/go/pkg/mod/github.com/ethereum/go-ethereum@v1.14.11/accounts/abi/bind/base.go:444 +0x29b
  github.com/smartcontractkit/chainlink/v2/core/gethwrappers/generated/flux_aggregator_wrapper.(*FluxAggregatorFilterer).FilterAvailableFundsUpdated()
      /home/runner/work/chainlink/chainlink/core/gethwrappers/generated/flux_aggregator_wrapper/flux_aggregator_wrapper.go:1181 +0x[20](https://github.com/smartcontractkit/chainlink/actions/runs/11940570982/job/33283529603#step:19:21)7
  github.com/smartcontractkit/chainlink/v2/core/services/fluxmonitorv2_test.setupFluxAggregatorUniverse()
      /home/runner/work/chainlink/chainlink/core/services/fluxmonitorv2/integrations_test.go:177 +0x147b
  github.com/smartcontractkit/chainlink/v2/core/services/fluxmonitorv2_test.TestFluxMonitor_Deviation.func1()
      /home/runner/work/chainlink/chainlink/core/services/fluxmonitorv2/integrations_test.go:445 +0x7a
  testing.tRunner()
      /opt/hostedtoolcache/go/1.23.3/x64/src/testing/testing.go:1690 +0x[22](https://github.com/smartcontractkit/chainlink/actions/runs/11940570982/job/33283529603#step:19:23)6
  testing.(*T).Run.gowrap1()
      /opt/hostedtoolcache/go/1.23.3/x64/src/testing/testing.go:1743 +0x44

Goroutine 344 (running) created at:
  testing.(*T).Run()
      /opt/hostedtoolcache/go/1.[23](https://github.com/smartcontractkit/chainlink/actions/runs/11940570982/job/33283529603#step:19:24).3/x64/src/testing/testing.go:1743 +0x825
  github.com/smartcontractkit/chainlink/v2/core/services/fluxmonitorv2_test.TestFluxMonitor_Deviation()
      /home/runner/work/chainlink/chainlink/core/services/fluxmonitorv2/integrations_test.go:442 +0xcf
  testing.tRunner()
      /opt/hostedtoolcache/go/1.23.3/x64/src/testing/testing.go:1690 +0x226
  testing.(*T).Run.gowrap1()
      /opt/hostedtoolcache/go/1.23.3/x64/src/testing/testing.go:1743 +0x44

Goroutine 343 (running) created at:
  testing.(*T).Run()
      /opt/hostedtoolcache/go/1.23.3/x64/src/testing/testing.go:1743 +0x8[25](https://github.com/smartcontractkit/chainlink/actions/runs/11940570982/job/33283529603#step:19:26)
  github.com/smartcontractkit/chainlink/v2/core/services/fluxmonitorv2_test.TestFluxMonitor_Deviation()
      /home/runner/work/chainlink/chainlink/core/services/fluxmonitorv2/integrations_test.go:442 +0xcf
  testing.tRunner()
      /opt/hostedtoolcache/go/1.23.3/x64/src/testing/testing.go:1690 +0x2[26](https://github.com/smartcontractkit/chainlink/actions/runs/11940570982/job/33283529603#step:19:27)
  testing.(*T).Run.gowrap1()
      /opt/hostedtoolcache/go/1.23.3/x64/src/testing/testing.go:1743 +0x44
==================

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