Support env var to only compare http log events with given URL prefix

[maqiuyujoyce]

Change description

When there are a lot of dependent non-direct resources in the test case, the comparison between real GCP http log and mock GCP http log can be messy. With the new env var ONLY_COMPARE_URL_PREFIX, we can focus on the comparison of the target resource/API in the http log events.

Tests you have done

• [N/A] Run make ready-pr to ensure this PR is ready for review.
• [X] Perform necessary E2E testing for changed resources.

[justinsb]

Some nits but not blocking. Will approve & hold so you can see them before they disappear!

/approve /lgtm /hold

[google-oss-prow[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: justinsb

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[yuwenma]

/lgtm

[maqiuyujoyce]

/hold cancel