DAOS-16765 test: pool/verify_space.py - Increase timeout

[shimizukko]

In the past few passing runs, the test had ~100 sec test time remaining at the end with 600 sec timeout. This means the test usually takes ~500 sec. Set the timeout to
normal test duration * 1.5 = 750 sec

Skip-unit-tests: true
Skip-fault-injection-test: true
Skip-func-hw-test-large-md-on-ssd: false
Test-tag: test_verify_pool_space

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[github-actions]

Ticket title is 'pool/verify_space.py:VerifyPoolSpace.test_verify_pool_space - test timeout in tearDown'
Status is 'Open'
Labels: 'weekly_test,md_on_ssd'
https://daosio.atlassian.net/browse/DAOS-16765