feat: add migration filter for list command

Author: btrn11

messages/package_pushupgrade_list.md

@@ -22,9 +22,9 @@ Number of days in the past for which to display the list of push upgrade request
 
 Status used to filter the list output Valid values are: Created, Canceled, Pending, In Progress, Failed, or Succeeded
 
-# flags.is-migration.summary
+# flags.show-push-migrations-only.summary
 
-Filter the list to show only push requests that were migrations (used the --migrate-to-2gp flag during scheduling).
+Display only push upgrade requests for package migrations.
 
 # flags.verbose.summary
 

src/commands/package/push-upgrade/list.ts

@@ -43,8 +43,8 @@ export class PackagePushRequestListCommand extends SfCommand<PackagePushRequestL
       char: 's',
       summary: messages.getMessage('flags.status.summary'),
     }),
-    'is-migration': Flags.boolean({
-      summary: messages.getMessage('flags.is-migration.summary'),
+    'show-push-migrations-only': Flags.boolean({
+      summary: messages.getMessage('flags.show-push-migrations-only.summary'),
     }),
   };
 
@@ -67,6 +67,7 @@ export class PackagePushRequestListCommand extends SfCommand<PackagePushRequestL
       packageId: flags.package,
       status: flags.status as PackagePushStatus | undefined,
       scheduledLastDays,
+      isMigration: flags['show-push-migrations-only']
     });
 
     if (results.length === 0) {