[bug] Bot checks removed Python files in a PR

**GitHub event:** `pull_request:opened`, `pull_request:synchronize`, `pull_request:ready_for_review`

**Example pull request/issue:** https://github.com/TheAlgorithms/Python/pull/3244

**Proposal:** Do not include any of the files whose attribute `status` is `removed`.