Update workflows for better test coverage and integration (#2344)

* ✨ (typescript_test.yml): add workflow_dispatch event to trigger workflow manually with branch input parameter

🔧 (typescript_test.yml): update workflow to checkout code from the specified branch when triggered manually

* 📝 (lint-py.yml): update linting workflow to trigger on specific pull request events and checks requested action

📝 (lint-py.yml): add a specific job to run Mypy for static type checking in the linting workflow

* 🔧 (python_test.yml): update pull_request event types and branches to trigger on more actions for better test coverage and integration