ci: give each umbrella job a unique name for branch protection

Rename all-checks-passed to host-checks-passed, benchmarks-passed,
and test-examples-passed so branch protection can require each
individually — prevents auto-merge from triggering when only the
fastest workflow completes.

Signed-off-by: danbugs <danilochiarlone@gmail.com>

Author: danbugs

.github/workflows/benchmarks.yml

@@ -516,7 +516,7 @@ jobs:
           comment-always: true
           alert-threshold: '130%'
 
-  all-checks-passed:
+  benchmarks-passed:
     if: always()
     needs: [build-image, bench-linux, bench-windows]
     runs-on: ubuntu-latest

.github/workflows/host-checks.yml

@@ -78,7 +78,7 @@ jobs:
           RUST_BACKTRACE: '1'
         run: cargo test --all-targets --locked
 
-  all-checks-passed:
+  host-checks-passed:
     if: always()
     needs: [checks]
     runs-on: ubuntu-latest

.github/workflows/test-examples.yml

@@ -768,7 +768,7 @@ jobs:
             exit 1
           }
 
-  all-checks-passed:
+  test-examples-passed:
     if: always()
     needs: [build-example, runtime-test, package-images-for-windows, runtime-test-windows, pyhl-snapshot-test]
     runs-on: ubuntu-latest