Add minimum token permissions for all GitHub workflow files

[Copilot]

This PR adds minimum token permissions to all GitHub workflow files to improve security posture according to OpenSSF Scorecard recommendations, specifically addressing the Token-Permissions check.

Changes Made

Root-Level Permissions Added

• Added permissions: contents: read to all workflows that only need basic read access
• Maintained existing permissions: read-all for ossf-scorecard.yml (already compliant)
• Applied proper formatting with blank lines above and below permissions blocks

Job-Level Permissions Added Where Needed

• benchmarks.yml: Added contents: write (for gh-pages push) and pull-requests: write (for PR comments)
• codeql-analysis.yml: Added security-events: write (for CodeQL results upload)
• release.yml: Added contents: write (for GitHub releases)
• prepare-release-branch.yml: Added pull-requests: write (for PR labels) to both jobs
• prepare-patch-release.yml: Added pull-requests: write (for PR labels)

Template Updates

• Updated all workflow templates (lint.yml.j2, test.yml.j2, misc.yml.j2) to include proper permissions
• Regenerated workflow files from templates with updated permissions
• Removed obsolete test_1.yml file that was no longer generated

Files Updated

• Manual workflows: backport.yml, benchmarks.yml, changelog.yml, check-links.yml, codeql-analysis.yml, contrib.yml, prepare-patch-release.yml, prepare-release-branch.yml, release.yml
• Generated workflows: lint_0.yml, test_0.yml, misc_0.yml
• Templates: All template files in .github/workflows/templates/

Security Impact

• Workflows using custom tokens (OPENTELEMETRYBOT_GITHUB_TOKEN) only receive basic read permissions
• Job-level permissions are added only where GITHUB_TOKEN is explicitly used
• All write permissions include trailing comments explaining their necessity
• Follows principle of least privilege while maintaining functionality

Verification

All 14 workflow files now pass OpenSSF Scorecard Token-Permissions requirements. The changes are minimal and surgical, maintaining existing functionality while improving security posture.

Fixes #20.

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