chore(python): drop config validate/simulate Python code, now native in Rust

[jd]

config validate (#1282) and config simulate (#1298) ship native
in the Rust binary. With the maturin wheel from the previous commit,
both routes resolve to the Rust dispatch — the Python implementations
are dead code, just waiting to drift out of sync with the Rust copy.

Per the post-port plan agreed during review, every command's Python
copy is removed in the same change that makes it releasable as a
single Rust source. For commands already merged before the rule was
adopted, this commit catches them up:

• Delete mergify_cli/config/ package (cli.py, validate.py).
• Delete mergify_cli/tests/config/ (the 18 Python tests for
  validate/simulate; the Rust crate's 24 tests cover the same surface
  plus extras).
• Drop the two [[command]] entries from PORT_STATUS.toml —
  the inventory test only needs to track Python commands, and
  these are no longer Python.
• Trim the cross-command exit-code contract suite of its three
  config-related cases; the Rust crate enforces those exit codes
  natively.
• Drop the from mergify_cli.config import cli as config_cli_mod
  import + matching cli.add_command(...) from the root Python CLI;
  with no Python config commands left, the config group disappears
  from the click tree (the Rust binary intercepts before any click
  group lookup, so end-users see no behavior change).

The wheel still builds, installs, and runs both mergify config validate (Rust native) and mergify --help (Python shim). 592 of
the previous 610 Python tests pass; the missing 18 are the deleted
config tests.

Depends-On: #1321

[jd]

This pull request is part of a Mergify stack:

#	Pull Request	Link
1	build(packaging): switch wheel build to maturin, ship Rust binary alongside Python source	#1321
2	chore(python): drop config validate/simulate Python code, now native in Rust	#1322	👈
3	feat(rust): port ci scopes-send to native Rust (Phase 1.4)	#1300
4	feat(rust): port queue pause and unpause to native Rust (Phase 1.5)	#1301
5	feat(rust): port ci git-refs and ci queue-info to native Rust (Phase 1.6)	#1302

[mergify]

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• depends-on = Mergifyio/mergify-cli#1321 [⛓️ build(packaging): switch wheel build to maturin, ship Rust binary alongside Python source #1321 [stack]]

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[jd]

Revision history

#	Type	Changes	Reason	Date
1	initial	1b53967		2026-04-30 12:09 UTC
2	content	1b53967 → a745f41		2026-04-30 12:09 UTC
3	rebase	a745f41 → 800a454		2026-04-30 13:08 UTC
4	rebase	800a454 → 75fad04		2026-04-30 13:30 UTC
5	rebase	75fad04 → 04d71cb		2026-04-30 14:06 UTC