[release-1.13] Containersource use OIDC identity of corresponding SinkBinding

[creydr]

Backport of #7890 (without e2e tests, as they require a reconciler-test update).

Manual backport, as of #7892 (comment)

[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

All modified and coverable lines are covered by tests ✅

Project coverage is 70.22%. Comparing base (d045c98) to head (4e0e3c9).
Report is 2 commits behind head on release-1.13.

Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.13    #7898      +/-   ##
================================================
+ Coverage         69.38%   70.22%   +0.84%     
================================================
  Files               336      336              
  Lines             19162    15303    -3859     
================================================
- Hits              13296    10747    -2549     
+ Misses             5209     3898    -1311     
- Partials            657      658       +1     

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