[#3207] fix(test): Trigger integration test with changes in module `i…

…ntegration-test-common` (#3201)

### What changes were proposed in this pull request?

Trigger integration test when there is a change in module
`integration-test-common`.

### Why are the changes needed?

We should start the integration test if there are changes in module
`integration-test-common`. however, CI
https://github.com/datastrato/gravitino/actions/runs/8872110159/job/24356012525?pr=3197
of PR #3197 can't start the
CI pipeline.

Fixed: #3207 

### Does this PR introduce _any_ user-facing change?

N/A.

### How was this patch tested?

CI passed.

.github/workflows/backend-integration-test.yml

@@ -36,6 +36,7 @@ jobs:
               - dev/**
               - gradle/**
               - integration-test/**
+              - integration-test-common/**
               - meta/**
               - server/**
               - server-common/**

integration-test-common/src/test/java/com/datastrato/gravitino/integration/test/MiniGravitino.java

@@ -41,6 +41,10 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+/**
+ * MiniGravitino is a mini Gravitino server for integration tests. It starts a Gravitino server in
+ * the same JVM process.
+ */
 public class MiniGravitino {
   private static final Logger LOG = LoggerFactory.getLogger(MiniGravitino.class);
   private MiniGravitinoContext context;