Fix JobSink to support AuthZ on GET too

[creydr]

Proposed Changes

• 🐛 Fix JobSink to support AuthZ on GET too
• 🧹 Remove deprecated auth.VerifyJWTFromRequest() method.

[pierDipi]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: creydr, pierDipi

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 10 lines in your changes missing coverage. Please review.

Project coverage is 67.47%. Comparing base (608e76c) to head (1e1a860).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/jobsink/main.go	0.00%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8196      +/-   ##
==========================================
+ Coverage   67.45%   67.47%   +0.01%     
==========================================
  Files         371      371              
  Lines       18039    18036       -3     
==========================================
  Hits        12169    12169              
+ Misses       5091     5088       -3     
  Partials      779      779              

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