Simplify root CI to grouped-tests.yml (matrix from test/test_groups.toml) (SciML#1222)

Replace the hand-maintained group x version matrix in the root CI.yml
test job with the thin grouped-tests.yml@v1 caller, which builds the
matrix from test/test_groups.toml via
compute_affected_sublibraries.jl --root-matrix.

The root test_groups.toml is trimmed to the groups the root CI workflow
actually ran (Core on lts/1/pre, QA on lts/1). The GPU group that the
monorepo uniformization added speculatively is dropped because the root
CI workflow never dispatched it (no self-hosted GPU job existed), so
keeping it would invent a matrix cell that did not run before.

coverage-directories is preserved verbatim as the only non-default
with: input; group dispatch stays on the default GROUP env var, which
the root runtests.jl reads, and coverage/check-bounds keep their
defaults to match the old root tests.yml call. The workflow filename and
name: CI are unchanged so the branch-protection status check name is
preserved.

Verified the computed root matrix equals the old workflow matrix exactly
(5/5): {(Core,lts),(Core,1),(Core,pre),(QA,lts),(QA,1)}.

Co-authored-by: ChrisRackauckas-Claude <accounts@chrisrackauckas.com>
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: 3 people

.github/workflows/CI.yml

@@ -14,25 +14,8 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: ${{ github.ref_name != github.event.repository.default_branch || github.ref != 'refs/tags/v*' }}
 jobs:
-  test:
-    name: "Tests"
-    strategy:
-      fail-fast: false
-      matrix:
-        group:
-          - "Core"
-        version:
-          - "lts"
-          - "1"
-          - "pre"
-        include:
-          - group: "QA"
-            version: "lts"
-          - group: "QA"
-            version: "1"
-    uses: "SciML/.github/.github/workflows/tests.yml@v1"
+  tests:
+    uses: "SciML/.github/.github/workflows/grouped-tests.yml@v1"
     with:
-      julia-version: "${{ matrix.version }}"
-      group: "${{ matrix.group }}"
       coverage-directories: "src,lib/OptimizationBase/src,lib/OptimizationBBO/src,lib/OptimizationCMAEvolutionStrategy/src,lib/OptimizationEvolutionary/src,lib/OptimizationGCMAES/src,lib/OptimizationIpopt/src,lib/OptimizationMadNLP/src,lib/OptimizationManopt/src,lib/OptimizationMOI/src,lib/OptimizationMetaheuristics/src,lib/OptimizationMultistartOptimization/src,lib/OptimizationNLopt/src,lib/OptimizationNOMAD/src,lib/OptimizationOptimJL/src,lib/OptimizationOptimisers/src,lib/OptimizationPolyalgorithms/src,lib/OptimizationQuadDIRECT/src,lib/OptimizationSpeedMapping/src"
     secrets: "inherit"

test/test_groups.toml

@@ -3,7 +3,3 @@ versions = ["lts", "1", "pre"]
 
 [QA]
 versions = ["lts", "1"]
-
-[GPU]
-versions = ["1"]
-runner = ["self-hosted", "Linux", "X64", "gpu"]