refactor: update git repository cloning mechanism.

[GdoongMathew]

Summary

As an extension of the last PR #569.

1. Using gitpython for git operation robustness.
2. Split the original download_repo into dedicated implementation.

[greptile-apps]

Greptile Summary

The PR replaces subprocess-based cloning with provider-specific GitPython helpers while retaining shallow, single-branch clones and sanitizing clone failures.

• Adds GitPython and its transitive dependencies.
• Routes GitHub, GitLab, and Bitbucket clones through dedicated helpers.
• Adds repository cloning, missing-Git, and credential-redaction tests.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
api/repository.py	Replaces the monolithic subprocess clone operation with provider-specific GitPython helpers, shallow-clone options, and centralized error sanitization; previously reported defects are no longer present.
tests/test_repository.py	Adds coverage for local and remote repository detection, missing Git, successful cloning, token masking, and network clones.
api/pyproject.toml	Adds GitPython as a runtime dependency.
api/poetry.lock	Locks GitPython and its gitdb and smmap transitive dependencies.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
  A[Repo.download] --> B{Repository type}
  B -->|GitHub| C[_clone_from_github]
  B -->|GitLab| D[_clone_from_gitlab]
  B -->|Bitbucket| E[_clone_from_bitbucket]
  B -->|Unknown| F[NotImplementedError]
  C --> G[GitRepo.clone_from]
  D --> G
  E --> G
  G -->|GitCommandError| H[_exception_cleanup]
  H --> I[Redacted ValueError]

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[greptile-apps]

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