[Test] Disable rare actions in RepoAnalysisFailureIT (elastic#104109)

Rare actions are disabled to improve CI stability.

Resolves: elastic#103791

x-pack/plugin/snapshot-repo-test-kit/src/internalClusterTest/java/org/elasticsearch/repositories/blobstore/testkit/RepositoryAnalysisFailureIT.java

@@ -154,6 +154,15 @@ public void testFailsOnChecksumMismatch() {
         final RepositoryAnalyzeAction.Request request = new RepositoryAnalyzeAction.Request("test-repo");
         request.maxBlobSize(ByteSizeValue.ofBytes(10L));
         request.abortWritePermitted(false);
+        // The analysis can perform writeAndOverwrite as a rare action.
+        // Since a read is performed towards the end of overwrite or write (rarely),
+        // it can return either the old (write) or the new (overwrite) content and both
+        // are considered to be correct.
+        // This test disrupts reads and relies on the disrupted content to be different from
+        // correct contents to trigger the expected failure. However, in rare cases,
+        // the disrupted old content could be identical to the new content or vice versa which
+        // leads to CI failures. Therefore, we disable rare actions to improve CI stability.
+        request.rareActionProbability(0.0);
 
         final CountDown countDown = new CountDown(between(1, request.getBlobCount()));