Configure E2E test to run on comments (#46572)

Summary:
This change configure the Test All job to enable the E2E tests with an input parameter.
Then it adds another workflow that is triggered on PRs when someone posts the "/test-e2e" comment.

## Changelog:
[Internal] - Let users run E2E tests on a specific PR comment

Pull Request resolved: https://github.com/facebook/react-native/pull/46572

Test Plan: This kind of things can only be tested once the PR lands, as workflows that are triggered by comments runs only from the main branch.

Reviewed By: cortinico

Differential Revision: D63021786

Pulled By: cipolleschi

fbshipit-source-id: 95b271f6de658ca208c773429fedef2a36417752

.github/workflows/trigger-e2e-on-comment.yml

@@ -0,0 +1,37 @@
+name: Trigger E2E Tests on Comment
+# This workflow is used to automatically trigger E2E tests when a comment is made
+# containing the text "/run-e2e-tests".
+
+on:
+  issue_comment:
+    types: [created]
+permissions:
+  contents: read
+jobs:
+  trigger-e2e-tests:
+    name: Trigger E2E Tests
+    runs-on: ubuntu-latest
+    if: github.event.issue.pull_request != '' && contains(github.event.comment.body, '/test-e2e')
+    steps:
+      - name: Install jq
+        run: brew install jq
+      - name: Run E2E Tests
+        run: |
+          # Github does not provide the branch of a PR when a comment on a PR is made
+          # So, given the issue number, which is the PR number, we can retrieve the branch with
+          # a quick API call
+          BRANCH=$(curl -L \
+            -H "Accept: application/vnd.github+json" \
+            -H "Authorization: Bearer $GITHUB_TOKEN" \
+            -H "X-GitHub-Api-Version: 2022-11-28" \
+            https://api.github.com/repos/facebook/react-native/pulls/$PR_NUMBER | jq -r '.head.ref')
+
+          curl -L \
+            -X POST \
+            -H "Accept: application/vnd.github+json" \
+            -H "Authorization: Bearer $GITHUB_TOKEN" \
+            -H "X-GitHub-Api-Version: 2022-11-28" \
+            -d "{\"ref\": \"$BRANCH\", \"inputs\": {\"run-e2e-tests\": \"true\"}}"
+        env:
+          GITHUB_TOKEN: ${{ secrets.REACT_NATIVE_BOT_GITHUB_TOKEN }}
+          PR_NUMBER: ${{ github.event.issue.number }}