Migrate from opentelemetrybot to otelbot

[Copilot]

This PR migrates the repository from using the legacy opentelemetrybot user account to the new otelbot GitHub App, as requested in the issue.

Changes Made

1. GitHub Workflow Updates (.github/workflows/release-please.yaml)

• Added GitHub App token creation step using actions/create-github-app-token@df432ceedc7162793a195dd1713ff69aefc7379e
• Updated token usage from the commented OPENTELEMETRYBOT_GITHUB_TOKEN to ${{ steps.otelbot-token.outputs.token }}
• The token creation step is placed directly before the first step that uses its output

2. Release Configuration Updates

• release-please-config.json: Updated signoff email from [email protected] to [email protected]
• .toys/.data/releases.yml: Updated git user configuration:
  • git_user_name: Changed from OpenTelemetry Bot to otelbot
  • git_user_email: Changed from [email protected] to [email protected]

Migration Details

• From: User account opentelemetrybot with personal access token
• To: GitHub App otelbot with app-based authentication
• Email migration: [email protected] → [email protected]

Verification

• All YAML and JSON files remain syntactically valid
• No remaining references to old opentelemetrybot credentials
• Changes follow the exact requirements specified in the issue

The migration ensures that:

1. The GitHub App token is generated using the proper secrets (OTELBOT_PRIVATE_KEY and OTELBOT_APP_ID)
2. All commit signatures and release configurations use the new otelbot identity
3. The workflow maintains the same functionality while using the more secure GitHub App authentication

Fixes #22.

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