[config] Don't log network_process.enabled by default

[pimlu]

What does this PR do?

network_process.enabled is true by default - changes this config to be logged when it is false (instead of the default).

Motivation

Reduce spurious logging from config.New() during tests.

Describe how you validated your changes

Possible Drawbacks / Trade-offs

Additional Notes

[agent-platform-auto-pr]

Test changes on VM

Use this command from test-infra-definitions to manually test this PR changes on a VM:

inv aws.create-vm --pipeline-id=51128103 --os-family=ubuntu

Note: This applies to commit 991ac73

[agent-platform-auto-pr]

Uncompressed package size comparison

Comparison with ancestor e87eaecb8358a40207a043f80e85cc173500a992

Diff per package

package	diff	status	size	ancestor	threshold
datadog-agent-amd64-deb	0.00MB	✅	1268.87MB	1268.87MB	140.00MB
datadog-agent-x86_64-rpm	0.00MB	✅	1278.10MB	1278.10MB	140.00MB
datadog-agent-x86_64-suse	0.00MB	✅	1278.10MB	1278.10MB	140.00MB
datadog-agent-arm64-deb	0.00MB	✅	1003.93MB	1003.93MB	140.00MB
datadog-agent-aarch64-rpm	0.00MB	✅	1013.15MB	1013.15MB	140.00MB
datadog-dogstatsd-amd64-deb	0.00MB	✅	78.52MB	78.52MB	10.00MB
datadog-dogstatsd-x86_64-rpm	0.00MB	✅	78.59MB	78.59MB	10.00MB
datadog-dogstatsd-x86_64-suse	0.00MB	✅	78.59MB	78.59MB	10.00MB
datadog-dogstatsd-arm64-deb	0.00MB	✅	55.74MB	55.74MB	10.00MB
datadog-heroku-agent-amd64-deb	0.00MB	✅	505.42MB	505.42MB	70.00MB
datadog-iot-agent-amd64-deb	0.00MB	✅	113.28MB	113.28MB	10.00MB
datadog-iot-agent-x86_64-rpm	0.00MB	✅	113.35MB	113.35MB	10.00MB
datadog-iot-agent-x86_64-suse	0.00MB	✅	113.35MB	113.35MB	10.00MB
datadog-iot-agent-arm64-deb	0.00MB	✅	108.76MB	108.76MB	10.00MB
datadog-iot-agent-aarch64-rpm	0.00MB	✅	108.83MB	108.83MB	10.00MB

Decision

✅ Passed