Fix e2e midstream CI mode

[fjglira]

What type of PR is this?

• Enhancement / New Feature
• Bug Fix
• Refactor
• Optimization
• Test
• Documentation Update

What this PR does / why we need it:

• Forcing the use of the external registry when CI flag is true
• Adding some debug information in case of failures
• Passing GINKGO_FLAGS properly to avoid failures in propagation in midstream

Which issue(s) this PR fixes:

Fixes #

Related Issue/PR #

Additional information:

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.17%. Comparing base (857518b) to head (5688d26).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1564      +/-   ##
==========================================
- Coverage   80.55%   80.17%   -0.39%     
==========================================
  Files          44       46       +2     
  Lines        2299     2345      +46     
==========================================
+ Hits         1852     1880      +28     
- Misses        328      344      +16     
- Partials      119      121       +2     

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[istio-testing]

In response to a cherrypick label: #1564 failed to apply on top of branch "release-1.28":

Applying: Adding some fix for midstream CI execution
Using index info to reconstruct a base tree...
M	tests/e2e/common-operator-integ-suite.sh
Falling back to patching base and 3-way merge...
Auto-merging tests/e2e/common-operator-integ-suite.sh
CONFLICT (content): Merge conflict in tests/e2e/common-operator-integ-suite.sh
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
hint: When you have resolved this problem, run "git am --continue".
hint: If you prefer to skip this patch, run "git am --skip" instead.
hint: To restore the original branch and stop patching, run "git am --abort".
hint: Disable this message with "git config set advice.mergeConflict false"
Patch failed at 0001 Adding some fix for midstream CI execution

[istio-testing]

In response to a cherrypick label: #1564 failed to apply on top of branch "release-1.27":

Applying: Adding some fix for midstream CI execution
Using index info to reconstruct a base tree...
M	tests/e2e/common-operator-integ-suite.sh
Falling back to patching base and 3-way merge...
Auto-merging tests/e2e/common-operator-integ-suite.sh
CONFLICT (content): Merge conflict in tests/e2e/common-operator-integ-suite.sh
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
hint: When you have resolved this problem, run "git am --continue".
hint: If you prefer to skip this patch, run "git am --skip" instead.
hint: To restore the original branch and stop patching, run "git am --abort".
hint: Disable this message with "git config set advice.mergeConflict false"
Patch failed at 0001 Adding some fix for midstream CI execution

[istio-testing]

In response to a cherrypick label: new issue created for failed cherrypick: #1567

[istio-testing]

In response to a cherrypick label: new issue created for failed cherrypick: #1566

[istio-testing]

In response to a cherrypick label: #1564 failed to apply on top of branch "release-1.28":

Applying: Adding some fix for midstream CI execution
Using index info to reconstruct a base tree...
M	tests/e2e/common-operator-integ-suite.sh
Falling back to patching base and 3-way merge...
Auto-merging tests/e2e/common-operator-integ-suite.sh
CONFLICT (content): Merge conflict in tests/e2e/common-operator-integ-suite.sh
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
hint: When you have resolved this problem, run "git am --continue".
hint: If you prefer to skip this patch, run "git am --skip" instead.
hint: To restore the original branch and stop patching, run "git am --abort".
hint: Disable this message with "git config set advice.mergeConflict false"
Patch failed at 0001 Adding some fix for midstream CI execution

[istio-testing]

In response to a cherrypick label: #1564 failed to apply on top of branch "release-1.27":

Applying: Adding some fix for midstream CI execution
Using index info to reconstruct a base tree...
M	tests/e2e/common-operator-integ-suite.sh
Falling back to patching base and 3-way merge...
Auto-merging tests/e2e/common-operator-integ-suite.sh
CONFLICT (content): Merge conflict in tests/e2e/common-operator-integ-suite.sh
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
hint: When you have resolved this problem, run "git am --continue".
hint: If you prefer to skip this patch, run "git am --skip" instead.
hint: To restore the original branch and stop patching, run "git am --abort".
hint: Disable this message with "git config set advice.mergeConflict false"
Patch failed at 0001 Adding some fix for midstream CI execution

[istio-testing]

In response to a cherrypick label: new issue created for failed cherrypick: #1568

[istio-testing]

In response to a cherrypick label: new issue created for failed cherrypick: #1569