pre-commit: silence markdownlint (#7067)

Closes #7064

Adding the two options will prevent their output to be printed to stdout.

See https://github.com/DavidAnson/markdownlint-cli2/tree/main?tab=readme-ov-file#markdownlint-cli2jsonc `noBanner` and `noProgress` options.

.markdownlint-cli2.yaml

@@ -7,6 +7,12 @@ config:
     siblings_only: true
   line-length: false
 
+# Hide the Finding: <list of globs> when markdownlint fixes files
+noProgress: true
+
+# Hide the markdownlint-cli and markdownlint versions on each block
+noBanner: true
+
 # Define glob expressions to ignore
 ignores:
   - ".github/**"