feat: Exclude Stride.Docs.sln updates from triggering the build

.github/workflows/stride-docs-staging-azure.yml

@@ -9,6 +9,7 @@ on:
       - staging
     paths-ignore:
       - 'README.md'
+      - 'Stride.Docs.sln'
       - 'BuildDocs.ps1'
       - 'wiki/**'
       - .gitignore

.github/workflows/stride-docs-staging-fast-track-azure.yml

@@ -9,6 +9,7 @@ on:
   #     - main
   #   paths-ignore:
   #     - 'README.md'
+  #     - 'Stride.Docs.sln'
   #     - 'BuildDocs.ps1'
   #     - 'wiki/**'
   #     - .gitignore