ci: raise timeout to 15m for JAX-heavy test jobs

The test-jax and test-cross-backend jobs run the full JAX suite, whose per-molecule JIT compilation already put them at ~9m54s on master — right at the 10-minute cap. The new F5/F6 surrogate-path regression tests added in this PR push both over, causing test-cross-backend to be cancelled at the timeout. Raise those two jobs to 15m for headroom; the fast backend jobs (openmm/tinker/psi4/jax-md/core, all <=1m) stay at 10m.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Author: ericchansen

.github/workflows/ci.yml

@@ -91,7 +91,7 @@ jobs:
     container:
       image: ghcr.io/ericchansen/q2mm/ci-jax:latest
       options: --user root
-    timeout-minutes: 10
+    timeout-minutes: 15
     steps:
       - uses: actions/checkout@v4
       - run: git config --global --add safe.directory "$GITHUB_WORKSPACE"
@@ -142,7 +142,7 @@ jobs:
     container:
       image: ghcr.io/ericchansen/q2mm/ci-full:latest
       options: --user root
-    timeout-minutes: 10
+    timeout-minutes: 15
     steps:
       - uses: actions/checkout@v4
       - run: git config --global --add safe.directory "$GITHUB_WORKSPACE"