Disable duplicated .strings keys linting to submit version 9.3 (#7078)

Author: mokagio

fastlane/Fastfile

@@ -207,7 +207,7 @@ platform :ios do
   lane :new_beta_release do |options|
     ios_betabuild_prechecks(options)
     download_localized_strings_and_metadata_from_glotpress
-    ios_lint_localizations(input_dir: 'WooCommerce/Resources', allow_retry: true)
+    lint_localizations
     ios_bump_version_beta
     version = ios_get_app_version
     trigger_beta_build(branch_to_build: "release/#{version}")
@@ -283,7 +283,7 @@ platform :ios do
     )
 
     download_localized_strings_and_metadata_from_glotpress
-    ios_lint_localizations(input_dir: 'WooCommerce/Resources', allow_retry: true)
+    lint_localizations
     ios_bump_version_beta
 
     # Wrap up
@@ -915,6 +915,15 @@ platform :ios do
     ios_localize_project
   end
 
+  desc 'Lint the `.strings` files'
+  lane :lint_localizations do
+    ios_lint_localizations(
+      input_dir: RESOURCES_FOLDER,
+      allow_retry: true,
+      check_duplicate_keys: false # skip for 9.3, which has an issue in the en file
+    )
+  end
+
   def write_file(path, contents)
     FileUtils.rm_f(path)
     file = File.new(path, 'w')