Migrate from opentelemetrybot to otelbot

[Copilot]

This PR migrates the repository from using the opentelemetrybot user account to the otelbot GitHub App for automated workflows and operations.

Changes Made

1. Token Migration

• Replaced all instances of ${{ secrets.OPENTELEMETRYBOT_GITHUB_TOKEN }} with ${{ steps.otelbot-token.outputs.token }}
• Added GitHub App token creation step directly before each step that uses the token:

  - uses: actions/create-github-app-token@df432ceedc7162793a195dd1713ff69aefc7379e # v2.0.6
    id: otelbot-token
    with:
      app-id: ${{ vars.OTELBOT_APP_ID }}
      private-key: ${{ secrets.OTELBOT_PRIVATE_KEY }}

2. Git Configuration Update

Updated .github/scripts/use-cla-approved-github-bot.sh:

• Changed git config user.name from opentelemetrybot to otelbot
• Changed git config user.email from [email protected] to [email protected]

3. Branch Name Updates

Updated all branch names from opentelemetrybot/ prefix to otelbot/ prefix in:

• prepare-release-branch.yml
• package-prepare-release.yml
• package-prepare-patch-release.yml
• backport.yml
• package-release.yml
• prepare-patch-release.yml

4. User Login Comparisons

Updated user login comparisons from opentelemetrybot to otelbot[bot] (with the [bot] suffix required for GitHub Apps) in:

• Workflow template: misc.yml.j2
• Generated workflow: misc_0.yml
• Manual workflow: changelog.yml

5. Workflow Files Updated

The following workflow files were updated:

• .github/workflows/prepare-release-branch.yml
• .github/workflows/package-prepare-release.yml
• .github/workflows/package-prepare-patch-release.yml
• .github/workflows/backport.yml
• .github/workflows/package-release.yml
• .github/workflows/prepare-patch-release.yml
• .github/workflows/changelog.yml
• .github/workflows/misc_0.yml

6. Template Updates

Updated the workflow generation template .github/workflows/generate_workflows_lib/src/generate_workflows_lib/misc.yml.j2 to use otelbot[bot] instead of opentelemetrybot.

Validation

• All workflow files are syntactically valid YAML
• No remaining references to opentelemetrybot or OPENTELEMETRYBOT_GITHUB_TOKEN
• Workflow generation continues to work correctly
• Git configuration script executes without errors

Fixes #22.

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