[JENKINS-69613] Reduce log output at INFO level

Require a non-default logging level to see messages related to polling
and indexing, including the "polling not triggered", "polling triggered",
and "indexing triggered" messages.

Only changes the logging level, not the availability of those log messages.

Author: MarkEWaite

src/main/java/hudson/plugins/git/GitStatus.java

@@ -390,7 +390,9 @@ public List<ResponseContributor> onNotifyCommit(String origin, URIish uri, Strin
 
                             SCMTrigger trigger = scmTriggerItem.getSCMTrigger();
                             if (trigger == null || trigger.isIgnorePostCommitHooks()) {
-                                LOGGER.log(Level.INFO, "no trigger, or post-commit hooks disabled, on {0}", project.getFullDisplayName());
+                                if (LOGGER.isLoggable(Level.FINE)) {
+                                    LOGGER.log(Level.FINE, "no trigger, or post-commit hooks disabled, on {0}", project.getFullDisplayName());
+                                }
                                 continue;
                             }
 
@@ -456,7 +458,9 @@ public List<ResponseContributor> onNotifyCommit(String origin, URIish uri, Strin
                                      * NOTE: This is not scheduling the build, just polling for changes
                                      * If the polling detects changes, it will schedule the build
                                      */
-                                    LOGGER.log(Level.INFO, "Triggering the polling of {0}", project.getFullDisplayName());
+                                    if (LOGGER.isLoggable(Level.FINE)) {
+                                        LOGGER.log(Level.FINE, "Triggering the polling of {0}", project.getFullDisplayName());
+                                    }
                                     trigger.run();
                                     result.add(new PollingScheduledResponseContributor(project));
                                     break SCMS; // no need to trigger the same project twice, so do not consider other GitSCMs in it

src/main/java/jenkins/plugins/git/GitSCMSource.java

@@ -646,7 +646,7 @@ public boolean isMatch(@NonNull SCM scm) {
                                     continue;
                                 }
                                 if (GitStatus.looselyMatches(uri, remote)) {
-                                    LOGGER.info("Triggering the indexing of " + owner.getFullDisplayName()
+                                    LOGGER.fine("Triggering the indexing of " + owner.getFullDisplayName()
                                             + " as a result of event from " + origin);
                                     triggerIndexing(owner, source);
                                     result.add(new GitStatus.ResponseContributor() {