Merge pull request #22185 from fengyuentau:ci_job_rename_3.4

Rename jobs for better understanding for branch 3.4

* rename jobs

* remove dots from job names

* correct ubuntu version for linux arm64

.github/workflows/PR-3.4.yaml

@@ -6,19 +6,19 @@ on:
       - 3.4
 
 jobs:
-  ARM64:
+  Ubuntu1804-ARM64:
     uses: opencv/ci-gha-workflow/.github/workflows/OCV-PR-3.4-ARM64.yaml@main
 
-  U20:
+  Ubuntu2004-x64:
     uses: opencv/ci-gha-workflow/.github/workflows/OCV-PR-3.4-U20.yaml@main
 
-  W10:
+  Windows10-x64:
     uses: opencv/ci-gha-workflow/.github/workflows/OCV-PR-3.4-W10.yaml@main
 
   macOS-ARM64:
     uses: opencv/ci-gha-workflow/.github/workflows/OCV-PR-3.4-macOS-ARM64.yaml@main
 
-  macOS-X64:
+  macOS-x64:
     uses: opencv/ci-gha-workflow/.github/workflows/OCV-PR-3.4-macOS-x86_64.yaml@main
 
   iOS: