fix(ci): render OpenTofu PR output

[xnoto]

Summary

• render OpenTofu plan comments as diff code blocks after removing ANSI control sequences
• capture and post redacted validation output for both passed and failed OpenTofu CI checks
• retain only the end of oversized validation output (12,000 characters); plan output remains capped to its final 1,000 lines
• give this repository’s CI PR comment the same sanitized, bounded output format and run it on ubuntu-latest until an arc runner scale set is available

Validation

• GitHub Actions PR checks are the validation authority; no local checks were run.

Security

• Reviewed the changed workflows: no secrets, credentials, state, kubeconfig data, or sensitive plan output were added. Captured output continues to redact token-like values; plan redaction remains in place.

[github-actions]

Shared workflows CI passed

View the workflow run.

Validation output (redacted, last 12000 characters)

[INFO] Initializing environment for https://github.com/pre-commit/pre-commit-hooks.
[INFO] Initializing environment for https://github.com/gitleaks/gitleaks.
[INFO] Initializing environment for https://github.com/rhysd/actionlint.
[INFO] Installing environment for https://github.com/pre-commit/pre-commit-hooks.
[INFO] Once installed this environment will be reused.
[INFO] This may take a few minutes...
[INFO] Installing environment for https://github.com/gitleaks/gitleaks.
[INFO] Once installed this environment will be reused.
[INFO] This may take a few minutes...
[INFO] Installing environment for https://github.com/rhysd/actionlint.
[INFO] Once installed this environment will be reused.
[INFO] This may take a few minutes...
check for case conflicts.................................................Passed
check for merge conflicts................................................Passed
check for broken symlinks............................(no files to check)Skipped
check vcs permalinks.....................................................Passed
detect destroyed symlinks................................................Passed
detect private key.......................................................Passed
mixed line ending........................................................Passed
trim trailing whitespace.................................................Passed
Detect hardcoded secrets.................................................Passed
Lint GitHub Actions workflow files.......................................Passed