[WIP] Fix tests for revision timeouts

[izabelacg]

Relates to #15089

* delete ./test/conformance/api/v1/revision_timeout_test.go since it is identical to ./test/e2e/timeout_test.go except for TestRevisionTimeout/writes_first_byte_before_timeout (learned that e2e and conformance aren't necessarily interchangeable)

• fix expected status code for TestRevisionTimeout/writes_first_byte_before_timeout and move/rename it to TestRevisionTimeout/exceeds_total_timeout_after_first_byte
• propose new TestRevisionTimeout/exceeds_idle_timeout that sets sleep time instead of initialSleep

Release Note

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.76%. Comparing base (c2d0af1) to head (cede1ec).
Report is 101 commits behind head on main.

❗ Current head cede1ec differs from pull request most recent head e42c706. Consider uploading reports for the commit e42c706 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15181      +/-   ##
==========================================
+ Coverage   84.11%   84.76%   +0.65%     
==========================================
  Files         213      218       +5     
  Lines       16783    13469    -3314     
==========================================
- Hits        14117    11417    -2700     
+ Misses       2315     1686     -629     
- Partials      351      366      +15     

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[knative-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: izabelacg
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[knative-prow]

@izabelacg: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
unit-tests_serving_main	e42c706	link	true	/test unit-tests
istio-latest-no-mesh_serving_main	e42c706	link	true	/test istio-latest-no-mesh
certmanager-integration-tests_serving_main	e42c706	link	true	/test certmanager-integration-tests

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