Revert install-pythons trim

The test server (libs/testserver/jobs.go:531) maps a task's spark_version
to a Python version (DBR 12 -> 3.9, 13 -> 3.10, 15 -> 3.11, >=16 -> 3.12)
and calls `uv venv --python <ver>` at runtime. Acceptance tests using DBR
12.2 (integration_whl/wrapper*) or EnvMatrix on UV_PYTHON (templates/
default-python/integration_classic) therefore require those versions to
be installed.

Measured on the prior CI run: installing only 3.10 took ~6.7s on Windows,
vs an estimated 30-60s for all five. Not worth breaking tests. The real
Windows setup cost is Setup Go (2m49s cache restore), which is a
different problem.

Keeping the pydabs_1000_tasks invariant exclusion from the prior commit;
linux/direct is now ~4m18s including reruns, under the <5 min target.

Co-authored-by: Isaac

Author: pietern

.github/actions/setup-build-environment/action.yml

@@ -38,7 +38,7 @@ runs:
         version: "0.8.9"
 
     - name: Install Python versions for tests
-      run: make install-pythons-test
+      run: make install-pythons
       shell: bash
 
     - name: Install ruff (Python linter and formatter)

Makefile

@@ -74,14 +74,6 @@ checks: tidy ws links
 install-pythons:
 	uv python install 3.9 3.10 3.11 3.12 3.13
 
-# Subset of Python versions needed for unit + acceptance tests in CI.
-# 3.13 is already provided by actions/setup-python; 3.10 is the default for
-# acceptance bundle tests (see acceptance/bundle/test.toml). Integration and
-# scheduled runs still use `install-pythons` to cover the full matrix.
-.PHONY: install-pythons-test
-install-pythons-test:
-	uv python install 3.10
-
 .PHONY: test
 test: test-unit test-acc
 

libs/patchwheel/patch_test.go

@@ -145,14 +145,6 @@ func TestPatchWheel(t *testing.T) {
 	for _, py := range pythonVersions {
 		t.Run(py, func(t *testing.T) {
 			t.Parallel()
-
-			// Skip if the interpreter is not available via uv. CI only installs
-			// a subset of versions to keep setup fast; the full matrix is
-			// exercised in integration and scheduled runs.
-			if err := exec.Command("uv", "python", "find", py).Run(); err != nil {
-				t.Skipf("%s not available: %v", py, err)
-			}
-
 			tempDir := t.TempDir()
 
 			projFiles := minimalPythonProject()