OSS: bump-oss-version -- update Podfile.lock later in the flow

Summary:
There was some hardcoded validation logic to verify package.json and gradle.properties update. Running `pod install` before that failed this validation on release branch, so let's move the pod update a bit later in the flow.

This also restrict the version number change check to the specific files for better reliability

Changelog: [Internal]

Reviewed By: sota000

Differential Revision: D31160139

fbshipit-source-id: d32470d7dfc48c2efab1d2767f3892b33e0b77dd

Author: fkgozali

Diff for: scripts/bump-oss-version.js

@@ -32,8 +32,6 @@ let argv = yargs
   }).argv;
 
 const nightlyBuild = argv.nightly;
-// Nightly builds don't need an update as main will already be up-to-date.
-const updatePodfileLock = !nightlyBuild;
 
 let version, branch;
 if (nightlyBuild) {
@@ -154,33 +152,38 @@ if (
 // Change react-native version in the template's package.json
 exec(`node scripts/set-rn-template-version.js ${version}`);
 
-if (updatePodfileLock) {
-  echo('Updating RNTester Podfile.lock...')
-  if (exec('source scripts/update_podfile_lock.sh && update_pods').code) {
-    echo('Failed to update RNTester Podfile.lock.');
-    echo('Fix the issue, revert and try again.');
-    exit(1);
-  }
-}
-
 // Verify that files changed, we just do a git diff and check how many times version is added across files
+const filesToValidate = [
+  'package.json',
+  'ReactAndroid/gradle.properties',
+  'template/package.json',
+];
 let numberOfChangedLinesWithNewVersion = exec(
-  `git diff -U0 | grep '^[+]' | grep -c ${version} `,
+  `git diff -U0 ${filesToValidate.join(' ')}| grep '^[+]' | grep -c ${version} `,
   {silent: true},
 ).stdout.trim();
 
 // Release builds should commit the version bumps, and create tags.
 // Nightly builds do not need to do that.
 if (!nightlyBuild) {
-  if (+numberOfChangedLinesWithNewVersion !== 3) {
+  if (+numberOfChangedLinesWithNewVersion !== filesToValidate.length) {
     echo(
-      'Failed to update all the files. package.json and gradle.properties must have versions in them',
+      `Failed to update all the files: [${filesToValidate.join(', ')}] must have versions in them`,
     );
     echo('Fix the issue, revert and try again');
     exec('git diff');
     exit(1);
   }
 
+  // Update Podfile.lock only on release builds, not nightly.
+  // Nightly builds don't need it as the main branch will already be up-to-date.
+  echo('Updating RNTester Podfile.lock...');
+  if (exec('source scripts/update_podfile_lock.sh && update_pods').code) {
+    echo('Failed to update RNTester Podfile.lock.');
+    echo('Fix the issue, revert and try again.');
+    exit(1);
+  }
+
   // Make commit [0.21.0-rc] Bump version numbers
   if (exec(`git commit -a -m "[${version}] Bump version numbers"`).code) {
     echo('failed to commit');