Ignore and do not watch idb files

Summary:
During development using Mobile Builds, I noticed that watchman and hg were picking up changes from idb temporary files.

These files should be ignored.

Reviewed By: passy

Differential Revision: D52693747

fbshipit-source-id: 772cdea8e55acd631d4cab1e4b7ab3faa3873c29

Author: lblasa

.gitignore

@@ -26,6 +26,11 @@ react-native/package-lock.json
 *.xcworkspace
 **/Pods/
 **/xcuserdata/
+**/idb-applications/
+**/idb-dsyms/
+**/idb-dylibs/
+**/idb-frameworks/
+**/idb-test-bundles/
 
 android/third-party/external/
 

desktop/scripts/start-flipper-server-dev.tsx

@@ -148,6 +148,11 @@ async function startWatchChanges() {
               '**/.*',
               '**/lib/**/*',
               '**/dist/**/*',
+              '**/idb-applications/**/*',
+              '**/idb-dsyms/**/*',
+              '**/idb-dylibs/**/*',
+              '**/idb-frameworks/**/*',
+              '**/idb-test-bundles/**/*',
             ],
           },
         ),