Reverting last commit since it didn't work

.github/workflows/staleness_check.yml

diff --git a/.github/workflows/staleness_check.yml b/.github/workflows/staleness_check.yml
index 458dd3b..d5c1a65 100644
--- a/.github/workflows/staleness_check.yml
+++ b/.github/workflows/staleness_check.yml
@@ -23,13 +23,13 @@
     strategy:
       fail-fast: false
       matrix:
-        branch: [main]
+        branch: [main, 25.x, 27.x, 28.x]
         os: [{ name: Linux, value: ubuntu-latest}]
-        include:
-          # If we are in a continuous run, test other release branches
-          - branch: ${{ inputs.continuous-run && '25.x' }}
-          - branch: ${{ inputs.continuous-run && '27.x' }}
-          - branch: ${{ inputs.continuous-run && '28.x' }}
+        exclude:
+          # If we are in a presubmit run, only test main
+          - branch: ${{ !inputs.continuous-run && '25.x' }}
+          - branch: ${{ !inputs.continuous-run && '27.x' }}
+          - branch: ${{ !inputs.continuous-run && '28.x' }}
 
     name: Test staleness ${{ matrix.os.name }} ${{ matrix.branch }}
     runs-on: ${{ matrix.os.value }}