Added CI pipeline with FastCV back-end.

Author: asmorkalov

.github/workflows/PR-4.x.yaml

@@ -14,6 +14,9 @@ jobs:
   Ubuntu2004-ARM64:
     uses: opencv/ci-gha-workflow/.github/workflows/OCV-Contrib-PR-4.x-ARM64.yaml@main
 
+  Ubuntu2004-ARM64-FastCV:
+    uses: opencv/ci-gha-workflow/.github/workflows/OCV-Contrib-PR-4.x-ARM64-FastCV.yaml@main
+
   Ubuntu2004-x64-CUDA:
     uses: opencv/ci-gha-workflow/.github/workflows/OCV-Contrib-PR-4.x-U20-Cuda.yaml@main