feat: unhide username/password/token flags for all builders

[Kunal1522]

Since PR #3298 fixed these credentials to work with all builders (host, pack, s2i), there's no reason to keep them hidden anymore.

Fixes #3299

[knative-prow]

@Kunal1522: The label(s) kind/<kind> cannot be applied, because the repository doesn't have them.

Details

In response to this:

Since PR #3298 fixed these credentials to work with all builders (host, pack, s2i), there's no reason to keep them hidden anymore.

Also added environment variable hints to flag descriptions.

/kind

Fixes #

Release Note

Docs

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Fixes #3299

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[knative-prow]

Hi @Kunal1522. 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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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 54.59%. Comparing base (f8dd264) to head (2cade19).
⚠️ Report is 21 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3420      +/-   ##
==========================================
- Coverage   54.74%   54.59%   -0.16%     
==========================================
  Files         173      179       +6     
  Lines       20112    20214     +102     
==========================================
+ Hits        11011    11036      +25     
- Misses       7992     8008      +16     
- Partials     1109     1170      +61     

Flag	Coverage Δ
e2e	38.54% <100.00%> (+15.58%)	⬆️
e2e go	32.72% <100.00%> (-2.66%)	⬇️
e2e node	28.62% <100.00%> (-2.55%)	⬇️
e2e python	32.23% <100.00%> (-2.68%)	⬇️
e2e quarkus	28.77% <100.00%> (-2.55%)	⬇️
e2e rust	28.18% <100.00%> (-2.55%)	⬇️
e2e springboot	26.64% <100.00%> (-2.56%)	⬇️
e2e typescript	28.73% <100.00%> (-2.55%)	⬇️
integration	17.59% <0.00%> (-1.05%)	⬇️
unit macos-14	42.25% <100.00%> (-2.43%)	⬇️
unit macos-latest	42.25% <100.00%> (-2.43%)	⬇️
unit ubuntu-24.04-arm	42.57% <100.00%> (-2.25%)	⬇️
unit ubuntu-latest	43.15% <100.00%> (-2.43%)	⬇️
unit windows-latest	42.28% <100.00%> (-2.43%)	⬇️

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[gauron99]

/ok-to-test

[gauron99]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: gauron99, Kunal1522

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Needs approval from an approver in each of these files:

• OWNERS [gauron99]

Approvers can indicate their approval by writing /approve in a comment
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[gauron99]

/hold to wait on @matejvasek @lkingland review