[release-1.20] Clean up auth for host builder

[knative-prow-robot]

This is an automated cherry-pick of #3298

fix: hidden flags username/password (and affiliated envvars) now work also for s2i and pack builder

[codecov]

Codecov Report

❌ Patch coverage is 47.61905% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 55.67%. Comparing base (c9d4c54) to head (a5c263b).

Files with missing lines	Patch %	Lines
cmd/client.go	8.33%	10 Missing and 1 partial ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.20    #3300      +/-   ##
================================================
+ Coverage         52.79%   55.67%   +2.87%     
================================================
  Files               134      134              
  Lines             13519    13516       -3     
================================================
+ Hits               7138     7525     +387     
+ Misses             5526     5061     -465     
- Partials            855      930      +75     

Flag	Coverage Δ
e2e-tests	?
integration-tests	54.67% <47.61%> (?)
unit-tests	46.74% <47.61%> (+0.03%)	⬆️

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[twoGiants]

/approve
/lgtm

[gauron99]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: gauron99, knative-prow-robot, twoGiants

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[gauron99]

This might not work, there might be bug in springboot template. Seems we fixed it only after 1.20?

[gauron99]

Indeed: 1.20 release Nov 5; bug fix Nov 11
#3181

[gauron99]

New backport PR #3301
Closing this one