feat(ng-dev/format): add staged files back

change the staged command so that after formatting it also adds
formatted files back to the staging area (unless --check is used
of course)

ng-dev/format/cli.ts

@@ -51,6 +51,9 @@ export function buildFormatParser(localYargs: yargs.Argv) {
         const executionCmd = check ? checkFiles : formatFiles;
         const allStagedFiles = GitClient.get().allStagedFiles();
         process.exitCode = await executionCmd(allStagedFiles);
+        if (!check && process.exitCode === 0) {
+          GitClient.get().runGraceful(['add', ...allStagedFiles]);
+        }
       },
     )
     .command(