ci/lava: Detect R8152 issues preemptively and retry

Supersedes !17352 (closed)

Implement a log-based retry hint for R8152 issue described in #6681 (closed), which is based on detecting these two consecutive lines:

r8152 <USB> eth0: Tx status -71
nfs: server <IP> not responding, still trying

Where and could be any IP and USB addresses, respectfully.

Extras

• Adds cancelled job status to represent preemptively retried jobs (introduced by R8152 known issue)
• Refactor lava_log.py into smaller modules
• Use yellow color for errors that should be recoverable by a retry

Closes: #6681 (closed)