Auto merge of #29923 - mrobinson:test-scripts, r=jdm

Combine all script tests into `test-scripts`

Remove:
    - tidy self test support from `./mach test`
    - `./mach test-idl`

Adds a `./mach test-scripts` command that is responsible for running all
Python script tests. Run this during the CI to catch regressions in
changes to scripts. The WebIDL tests are still *very* slow and there are
from Gecko, so only run them when "-a" is passed meaning all tests.

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---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `___` with appropriate data: -->
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] There are tests for these changes

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1 files changed, 1 insertions, 1 deletions

diff --git a/python/tidy/__init__.py b/python/tidy/__init__.py
index 74a15acad8f..4d834ec6d7a 100644
--- a/python/tidy/__init__.py
+++ b/python/tidy/__init__.py
@@ -8,4 +8,4 @@
 # except according to those terms.
 
 from .tidy import scan  # noqa
-from .test import do_tests  # noqa
+from .test import run_tests  # noqa