Centralize yarn install to use actions/yarn-install (#49174)

Summary:
This centralizes the invocation of yarn install to be via the `actions/yarn-install`.
It will make it easier to add a retry if we want for all the `yarn install` steps in all the workflows.

## Changelog:

[INTERNAL] -

Pull Request resolved: https://github.com/facebook/react-native/pull/49174

Test Plan: CI

Reviewed By: NickGerleman

Differential Revision: D69121525

Pulled By: cortinico

fbshipit-source-id: 135da2e172cdf95b2a0ef8fd3d25996ab9317167

.github/workflows/danger-pr.yml

@@ -18,9 +18,8 @@ jobs:
     if: github.repository == 'facebook/react-native'
     steps:
       - uses: actions/checkout@v4
-      - name: Run Yarn Install on Root
-        run: yarn install
-        working-directory: .
+      - name: Run yarn install
+        uses: ./.github/actions/yarn-install
       - name: Danger
         run: yarn danger ci --use-github-checks --failOnErrors
         working-directory: packages/react-native-bots