Names of the file parameters in a PEAC do not support hyphen '-'

An error is displayed in the logs when using hyphens in file parameters in a PEAC:

'Invalid expression in {''ats-reports.tar'': ''${{ resources.files.ats-reports
      }}'', ''testNG-reports.tar'': ''${{ resources.files.testNG-reports }}'', ''TEST-firefox_ko.xml'':
      ''${{ resources.files.TEST-firefox_ko }}''}: Invalid token -reports'