updated test trigger classes for policy tests

return policy metadata along with the CEL program as a result of the call to Programs()

fix typo in PolicyMetadata

add debug code to parse runfiles dir

add logs

replaced path with runfile path

update file paths of data files with runfiles paths

fix test failures

fix build rule for external test data path

update file path used to register messages from file descriptor

updated build rule parameter documentation

refactor build rule

…stead of adding it as an attribute

… variable