Add --https flag for e2e tests

[gouthamhusky]

This change introduces a --https flag for e2e tests

part of #1520

Changes:

• Add test/e2e/e2e_flags.go with --https flag infrastructure
• Update domain_mapping_test.go to respect --https flag when determining expected URL schemes
• Update test/README.md with documentation for the new flag

Testing:

• Flag parsing works correctly
• Tests compile without errors
• Flag is passed through test script properly
• Documentation updated

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: gouthamhusky / name: Goutham K (7d093f8, 830c07a, 9e7320f, a8af4a4, b09be45)

[knative-prow]

Welcome @gouthamhusky! It looks like this is your first PR to knative/client 🎉

[knative-prow]

Hi @gouthamhusky. Thanks for your PR.

I'm waiting for a knative member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[knative-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: gouthamhusky
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[dprotaso]

/ok-to-test

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.06%. Comparing base (e0ac318) to head (a8af4a4).
⚠️ Report is 13 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2076   +/-   ##
=======================================
  Coverage   70.06%   70.06%           
=======================================
  Files         233      233           
  Lines       16464    16464           
=======================================
  Hits        11535    11535           
  Misses       4123     4123           
  Partials      806      806           

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[knative-prow]

@gouthamhusky: 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
integration-tests-latest-release_client_main	a8af4a4	link	true	/test integration-tests-latest-release
integration-tests_client_main	a8af4a4	link	true	/test integration-tests

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