chore: replace depot.dev runners with GitHub-hosted runners (#17641)

## Summary
- Replace all `depot-ubuntu-24.04-8` runner references with the
equivalent GitHub-hosted `ubuntu-latest-8-cores` runner
- Updated across 4 workflow files: `ci-front.yaml`, `ci-server.yaml`,
`ci-emails.yaml`, `ci-sdk.yaml`
- Also updated cache key names in `ci-front.yaml` that referenced the
depot runner name

## Test plan
- [ ] Verify CI workflows run successfully on the new GitHub-hosted
larger runners
- [ ] Confirm cache keys work correctly with the updated naming

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

.github/workflows/ci-emails.yaml

@@ -25,7 +25,7 @@ jobs:
     needs: changed-files-check
     if: needs.changed-files-check.outputs.any_changed == 'true'
     timeout-minutes: 10
-    runs-on: depot-ubuntu-24.04-8
+    runs-on: ubuntu-latest-8-cores
     steps:
       - name: Fetch custom Github Actions and base branch history
         uses: actions/checkout@v4

.github/workflows/ci-front.yaml

@@ -14,8 +14,8 @@ concurrency:
 
 env:
   # restore-cache action adds 'v4-' prefix and '-<branch>-<sha>' suffix to the key
-  STORYBOOK_BUILD_CACHE_KEY_FOR_RESTORE_ACTION: storybook-build-depot-ubuntu-24.04-8-runner
-  STORYBOOK_BUILD_CACHE_KEY_FOR_SAVE_ACTION: v4-storybook-build-depot-ubuntu-24.04-8-runner-${{ github.ref_name }}-${{ github.sha }}
+  STORYBOOK_BUILD_CACHE_KEY_FOR_RESTORE_ACTION: storybook-build-ubuntu-latest-8-cores-runner
+  STORYBOOK_BUILD_CACHE_KEY_FOR_SAVE_ACTION: v4-storybook-build-ubuntu-latest-8-cores-runner-${{ github.ref_name }}-${{ github.sha }}
 
 jobs:
   changed-files-check:
@@ -39,7 +39,7 @@ jobs:
     needs: changed-files-check
     if: needs.changed-files-check.outputs.any_changed == 'true'
     timeout-minutes: 30
-    runs-on: depot-ubuntu-24.04-8
+    runs-on: ubuntu-latest-8-cores
     env:
       REACT_APP_SERVER_BASE_URL: http://localhost:3000
     steps:
@@ -65,7 +65,7 @@ jobs:
           key: ${{ env.STORYBOOK_BUILD_CACHE_KEY_FOR_SAVE_ACTION }}
   front-sb-test:
     timeout-minutes: 30
-    runs-on: depot-ubuntu-24.04-8
+    runs-on: ubuntu-latest-8-cores
     needs: front-sb-build
     strategy:
       fail-fast: false
@@ -140,7 +140,7 @@ jobs:
     timeout-minutes: 30
     if: false
     needs: front-sb-build
-    runs-on: depot-ubuntu-24.04-8
+    runs-on: ubuntu-latest-8-cores
     env:
       REACT_APP_SERVER_BASE_URL: http://127.0.0.1:3000
       CHROMATIC_PROJECT_TOKEN: ${{ secrets.CHROMATIC_PROJECT_TOKEN }}
@@ -206,7 +206,7 @@ jobs:
     needs: changed-files-check
     if: needs.changed-files-check.outputs.any_changed == 'true'
     timeout-minutes: 30
-    runs-on: depot-ubuntu-24.04-8
+    runs-on: ubuntu-latest-8-cores
     env:
       NODE_OPTIONS: "--max-old-space-size=10240"
     steps:

.github/workflows/ci-sdk.yaml

@@ -47,7 +47,7 @@ jobs:
   # TODO uncomment when syncApplication resolver is fixed
   # sdk-e2e-integration-test:
   #   timeout-minutes: 30
-  #   runs-on: depot-ubuntu-24.04-8
+  #   runs-on: ubuntu-latest-8-cores
   #   needs: [changed-files-check, sdk-test]
   #   strategy:
   #     matrix:

.github/workflows/ci-server.yaml

@@ -31,7 +31,7 @@ jobs:
     needs: changed-files-check
     if: needs.changed-files-check.outputs.any_changed == 'true'
     timeout-minutes: 30
-    runs-on: depot-ubuntu-24.04-8
+    runs-on: ubuntu-latest-8-cores
     services:
       postgres:
         image: twentycrm/twenty-postgres-spilo
@@ -143,7 +143,7 @@ jobs:
           key: ${{ steps.restore-server-setup-cache.outputs.cache-primary-key }}
   server-test:
     timeout-minutes: 30
-    runs-on: depot-ubuntu-24.04-8
+    runs-on: ubuntu-latest-8-cores
     needs: server-setup
     steps:
       - name: Fetch custom Github Actions and base branch history
@@ -164,7 +164,7 @@ jobs:
 
   server-integration-test:
     timeout-minutes: 30
-    runs-on: depot-ubuntu-24.04-8
+    runs-on: ubuntu-latest-8-cores
     needs: server-setup
     strategy:
       fail-fast: false