chore(ci): remove unused recordings (backport #4074) (#4141)

Added a script to cleanup recordings. While doing this, moved the CI
matrix generation to a separate script so there is a single source of
truth for the matrix.

Ran the cleanup script as:
```
PYTHONPATH=. python scripts/cleanup_recordings.py
```

Also added this as part of the pre-commit workflow to ensure that the
recordings are always up to date and that no stale recordings are left
in the repo.
<hr>This is an automatic backport of pull request #4074 done by
[Mergify](https://mergify.com).

---------

Co-authored-by: Ashwin Bharambe <ashwin.bharambe@gmail.com>

tests/integration/ci_matrix.json

@@ -0,0 +1,6 @@
+{
+  "default": [
+    {"suite": "base", "setup": "ollama"},
+    {"suite": "vision", "setup": "ollama-vision"}
+  ]
+}