Do not run TestTLSCertificateRotation in parallel with other tests

[mgencur]

This test deletes the serving-tests/serving-certs during the test run. This might break the other test TestSystemInternalTLS because it waits for certain log lines to appear in the service pods. Deleting the serving-certs secret causes the application pods to be deleted so that the new cert can be mounted. And waiting for given log lines then fails because the pod no longer exists:

system_internal_tls_test.go:110: TLS not used on requests to queue-proxy: pods
"system-internal-tls-wgvxqtyx-00001-deployment-6fdc4c8c7d-4ll8q" not found

Fixes #

Proposed Changes

*

Release Note

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 84.60%. Comparing base (7643497) to head (f4d1070).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #15417 +/- ## ========================================== - Coverage 84.62% 84.60% -0.03% ========================================== Files 219 219 Lines 13587 13587 ========================================== - Hits 11498 11495 -3 - Misses 1722 1726 +4 + Partials 367 366 -1 ```

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[knative-prow[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mgencur, ReToCode

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