Address linting and fix unit test flakiness

[aqstack]

Description

Address lint error and test flakiness in PollerTest by increasing polling interval to 100ms to fix failing bump-dependencies job. Increasing the interval ensures Poll() runs less frequently giving the test more time to perform the assertions before the channel is updated.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Testing performed?

• Unit tests
• Integration tests
• Acceptance tests

Checklist:

• This PR is being made against the main branch, or relevant version branch
• I have made corresponding changes to the documentation
• I have added testing for my changes

If you have any questions, or want to get attention for a PR or issue please reach out on the #logging-and-metrics channel in the cloudfoundry slack