[FEATURE] Rename databricks_repo into databricks_git_folder

[WeiJun428]

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Changes

This PR attempts to fix the issue #3448. It

• Replaces all usage of databricks_repo to databricks_git_folder
• Renames docs/resources/repo.md to docs/resources/git_folder.md and update all the references in the docs folder accordingly.

Tests

• [x] make test run locally
• [x] relevant change in docs/ folder
• [x] covered with integration tests in internal/acceptance
• [ ] using Go SDK
• [ ] using TF Plugin Framework