Remove check_flit_worktree_compatibility once upstream flit fix ships #65772

Background

PR #65771 adds check_flit_worktree_compatibility to dev/breeze/src/airflow_breeze/prepare_providers/provider_distributions.py. The check refuses to build provider sdists when the source tree is a git worktree, because two related things go wrong otherwise and no warning is emitted:

1. flit worktree detection bug. flit.vcs.identify_vcs only checks .git.is_dir(), missing the .git-as-file pointer that git uses for worktrees and submodules. flit silently falls back to a non-VCS sdist that omits tracked files (docs/, tests/, provider.yaml, anything declared in [tool.flit.sdist] include), and the resulting packages fail reproducibility checks against the released sdists on dist.apache.org.
2. Breeze Docker-mount case. Even once flit is fixed, when Breeze runs the build inside Docker only the worktree directory is bind-mounted — the absolute gitdir: path baked into the worktree's .git file references the main repo's .git/worktrees/<name> directory on the host, which is not reachable from the container. git ls-files then fails or misbehaves.

Upstream flit tracking:

• Issue: flit sdist silently drops tracked files when built from a git worktree pypa/flit#798
• PR: Detect git worktrees and submodules in identify_vcs pypa/flit#799

What to do when this issue is actioned

Once both of the following hold:

• The flit fix (Detect git worktrees and submodules in identify_vcs pypa/flit#799) is merged and released.
• Airflow's constraints pin to a flit release that contains the fix, and the Breeze Docker image is rebuilt to include that version.

…and the Docker-mount case has been addressed (either by mounting the main repo's .git/worktrees/<name> directory alongside the worktree, or by rewriting the gitdir: pointer when sources are staged into the container, or by deciding the Docker-mount path is not supported from worktrees), remove:

• check_flit_worktree_compatibility in dev/breeze/src/airflow_breeze/prepare_providers/provider_distributions.py
• Its call site in dev/breeze/src/airflow_breeze/commands/release_management_commands.py
• Its tests in dev/breeze/tests/test_provider_distributions.py

If only the flit fix lands but the Docker-mount case is still broken, the check must stay (or be narrowed to the Docker case only) — the silent-incomplete-sdist failure is severe enough that we should not let a release train run into it unguarded.

Acceptance criteria

• Provider sdists built from a git worktree add ... directory via breeze release-management prepare-provider-distributions --distribution-format sdist match byte-for-byte with sdists built from a plain git checkout of the same commit.
• The same command run inside Breeze's Docker container from a worktree either succeeds with matching sdists or produces a clear, explicit error (not a silent incomplete tarball).
• check_flit_worktree_compatibility removed and PR Breeze: fail fast when building provider sdists from a git worktree #65771's test coverage deleted along with it.

Related

• PR Breeze: fail fast when building provider sdists from a git worktree #65771 — where the workaround lives.