chore: remove owlbot

[JoeWang1127]

No description provided.

[generated-files-bot]

Warning: This pull request is touching the following templated files:

• .github/generated-files-bot.yml
• codecov.yaml

[JoeWang1127]

This error in CodeQL/Analyze (python) is caused by deletion of owlbot.py.

 CodeQL did not detect any code written in languages supported by this CodeQL distribution (C#, Java/Kotlin, JavaScript/TypeScript, XML, Swift, YAML, Java Properties Files, C/C++, CSV, Ruby, HTML, Python or Go). Confirm that there is some source code for one of these languages in the project. For more information, review our troubleshooting guide at https://gh.io/troubleshooting-code-scanning/no-source-code-seen-during-build .
  Error: Encountered a fatal error while running "/opt/hostedtoolcache/CodeQL/2.18.2/x64/codeql/codeql database finalize --finalize-dataset --threads=4 --ram=14567 /home/runner/work/_temp/codeql_databases/python". Exit code was 32 and last log line was: CodeQL did not detect any code written in languages supported by this CodeQL distribution (C#, Java/Kotlin, JavaScript/TypeScript, XML, Swift, YAML, Java Properties Files, C/C++, CSV, Ruby, HTML, Python or Go). Confirm that there is some source code for one of these languages in the project. For more information, review our troubleshooting guide at https://gh.io/troubleshooting-code-scanning/no-source-code-seen-during-build . See the logs for more details.