Add build scan tag when running in FIPS mode (#55960)

gradle/build-scan.gradle

@@ -15,6 +15,11 @@ buildScan {
 
   tag OS.current().name()
 
+  // Tag if this build is run in FIPS mode
+  if (BuildParams.inFipsJvm) {
+    tag 'FIPS'
+  }
+
   // Automatically publish scans from Elasticsearch CI
   if (jenkinsUrl?.host?.endsWith('elastic.co')) {
     publishAlways()