Replace whole repo with latest content from branch stream-5.3.1-rhel-8.8.0

Content corresponds with RHEL dist-git commit 968eeef

.gitignore

@@ -1,2 +1,2 @@
-SOURCES/5.4.1.tar.gz
+/5.3.1.tar.gz
 /5.4.1.tar.gz

gating.yaml

@@ -1,6 +0,0 @@
---- !Policy
-product_versions:
-  - rhel-9
-decision_context: osci_compose_gate
-rules:
-  - !PassingTestCaseRule {test_case_name: baseos-ci.brew-build.tier1.functional}