Automated cherry pick of #7185: fix unrendered templates

[AbhinavPInamdar]

Cherry pick of #7185 on release-1.16.
#7185: fix unrendered templates, Part of #7292
For details on the cherry pick process, see the cherry pick requests page.

`karmada-chart`: Fixed unrendered `{{ ca_crt }}` during upgrades.

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[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This cherry-picked pull request resolves a critical issue in the karmada-chart where certificate authority (CA) templates were failing to render during upgrades. The fix involves a subtle but important change in how kubectl output is handled, ensuring that necessary substitutions occur as intended across various scripts and configurations.

Highlights

• Template Rendering Fix: Addressed an issue where {{ ca_crt }} templates were not being rendered correctly during upgrades within the karmada-chart.
• Output Format Consistency: Updated kubectl get configmap commands from using -o yaml to -o json to ensure consistent and reliable string substitution with sed.

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[gemini-code-assist]

Code Review

This pull request consistently updates kubectl get configmap commands to output in JSON format instead of YAML. This change is applied across the pre-upgrade-job.yaml template, the customresourceinterpreter example's README.md, and both pre-run-e2e.sh and post-run-e2e.sh scripts. I have no feedback to provide.

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 46.69%. Comparing base (4a83ef2) to head (f11b026).
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Additional details and impacted files

@@              Coverage Diff              @@
##           release-1.16    #7330   +/-   ##
=============================================
  Coverage         46.69%   46.69%           
=============================================
  Files               699      699           
  Lines             48200    48200           
=============================================
  Hits              22506    22506           
  Misses            23999    23999           
  Partials           1695     1695           

Flag	Coverage Δ
unittests	46.69% <ø> (ø)

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