Simplify workflow path filters by removing unnecessary negation pattern

Remove the '!\*\*' exclude-all-then-include pattern from dotnet and docker
workflows. The simple inclusive path filter ('sample-dir/\*\*') produces
identical behavior and matches the convention used by the node workflows.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: codebytes

.github/workflows/10-dotnet.yml

@@ -5,12 +5,10 @@ on:
   push:
     branches: [main]
     paths:
-      - '!**'
       - 'dotnet-sample/**'
   pull_request:
     branches: [main]
     paths:
-      - '!**'
       - 'dotnet-sample/**'
 
 permissions:

.github/workflows/docker-image.yml

@@ -5,12 +5,10 @@ on:
   push:
     branches: [main]
     paths:
-      - '!**'
       - 'container-example/**'
   pull_request:
     branches: [main]
     paths:
-      - '!**'
       - 'container-example/**'
 
 defaults: