ci(mobile): stop building the iOS simulator app twice

The native lane ran a full `flutter build ios --simulator --debug`, then
`xcodebuild test` rebuilt Pods and Runner from scratch. Generate the Xcode
config and Pods with `--config-only` instead. The test step still builds and
links Runner for the arm64 simulator, so the ML Kit link regression from
#7646 stays covered.

Also select the mobile lanes when `_ci-clients.yml` changes, so edits to
the mobile CI workflow run the jobs they change.

Signed-off-by: Fizz <6be7be23ec5bba868f3e1db5ec86013d76bd1a293dce5b435a192158fec13641@buzz.block.builderlab.xyz>

.github/workflows/_ci-clients.yml

@@ -210,9 +210,12 @@ jobs:
       - name: Test native pagination geometry
         if: matrix.lane == 'native'
         run: /bin/bash scripts/test-mobile-pagination.sh
-      - name: Build complete iOS simulator app
+      # Generate the Xcode config and Pods only. The xcodebuild test below
+      # builds and links the full simulator app, which catches simulator
+      # link regressions without a second full build.
+      - name: Prepare iOS simulator project
         if: matrix.lane == 'native'
-        run: cd mobile && flutter build ios --simulator --debug --no-pub
+        run: cd mobile && flutter build ios --config-only --simulator --debug --no-pub
       - name: Test native controls and push navigation bridge
         if: matrix.lane == 'native'
         run: |

.github/workflows/ci.yml

@@ -87,6 +87,7 @@ jobs:
               - 'web/**'
               - 'pnpm-lock.yaml'
             mobile:
+              - '.github/workflows/_ci-clients.yml'
               - 'mobile/**'
               - 'Justfile'
               - 'scripts/test-mobile-gateway-recipes.sh'