github: master branch protection tune.

* Strict master branch protection requires all PR to be in sync with latest
  master even if changes are not related and there are no conflicts.
* Because we have lots of daily merges this blocks most of the PRs as they
  are forced to be rebased on top of current master.
* This also causes unnecessary automatic CI rebuild of each rebase.
* Therefore we are setting strict status checks setting to false.
* required_signatures in github means not only `git commit -s` but also
  cryptographic signature which is not required by us, setting false.
* Disable "contexts" checks enforcement, that cause CI problems, mark TODO.

References:
https://github.com/apache/infrastructure-asfyaml?tab=readme-ov-file
https://docs.github.com/en/authentication/managing-commit-signature-verification/about-commit-signature-verification
https://docs.github.com/en/authentication/managing-commit-signature-verification/signing-commits

Signed-off-by: Tomasz 'CeDeROM' CEDRO <tomek@cedro.info>

.asf.yaml

@@ -19,15 +19,16 @@ github:
   protected_branches:
     master:
       required_status_checks:
-        strict: true
+        strict: false
-        contexts:
+# Contexts cause hanging CI etc disable for now.
-          - Check
+#        contexts:
-          - Lint
+#          - Check
-          - Build
+#          - Lint
+#          - Build
       required_pull_request_reviews:
         dismiss_stale_reviews: true
         require_last_push_approval: true
         required_approving_review_count: 2
       required_linear_history: true
-      required_signatures: true
+      required_signatures: false
       required_conversation_resolution: true