[build] Add spotless for other files (#3007)

Adds spotless formatting for Gradle, xml, md, and gitignore files.

yml linting is not performed as it requires a dependency on npm.

shared/javaDesktopTestTask.gradle

@@ -1,3 +1,3 @@
 tasks.register('testDesktopJava') {
-  dependsOn test
+    dependsOn test
 }