hydra: refine error marking

Dependencies

• [2] DOQSWDUG mark lines with FAILURE as error
• [3] 4TNF7TWX mark BUILD FAILED as error
• [4] BA46C5LN * Pretty-print the logs.

Change contents

• replacement in src/xsl/mark-errors.xsl at line 16
  [3.56]→[4.6426:6475](∅→∅),[4.6426]→[4.6426:6475](∅→∅)
  − contains(text(), 'FAIL:') or
  [3.56]

  [2.0]
  + starts-with(text(), 'FAIL:') or
• edit in src/xsl/mark-errors.xsl at line 18
  [2.51]

  [4.6475]
  + contains(text(), '[ERROR]') or