Limit test predictions for DirectMapping strategy

From Draft to Ready

• !45 (merged) is merged
• The target branch is master

Context

Closes gitlab-org/gitlab#450374 (closed)

What's in this MR?

[Feature] Add limit_percentage and limit_min options for DirectMatching

exe/tff

@@ -6,9 +6,9 @@ require 'test_file_finder'
 options = TestFileFinder::OptionParser.parse!(ARGV)
 
 TestFileFinder::FileFinder.new(paths: ARGV).tap do |file_finder|
-  file_finder.use TestFileFinder::MappingStrategies::DirectMatching.new(options.json) if options.json
+  file_finder.use TestFileFinder::MappingStrategies::DirectMatching.load_json(options.json) if options.json
 
-  file_finder.use TestFileFinder::MappingStrategies::PatternMatching.new(options.mapping_file) if options.mapping_file
+  file_finder.use TestFileFinder::MappingStrategies::PatternMatching.load(options.mapping_file) if options.mapping_file
 
   file_finder.use TestFileFinder::MappingStrategies::GitlabMergeRequestRspecFailure.new(project_path: options.project_path, merge_request_iid: options.merge_request_iid) if options.project_path && options.merge_request_iid