Update trials extractors to handle clean first trial

[k1o0]

The next release of iblrig (which version number?) will no longer have the camera trigger in the main state machine, meaning the first trial will have a normal length Bpod TTL. The extractors should be updated accordingly.

• Acquire test session with new state machine
• Check for the specific state name: Trial 0 used to include a state named delay_initiation - this state no longer exists (see here). Should be safer than merely checking for the version (given custom tasks).
• Modify extractors to check the version before attempting to reassign first trial pulses. See point above.
• Timeline extractor and camlog extractor
• Add integration test for extraction of trials with new state machine
• Check that camera extraction is OK (should be - missing pulses at start are extrapolated)
• Release ibllib changes before releasing iblrig

Relevant lines:
https://github.com/int-brain-lab/ibllib/blob/fa6d722c6970ad5a29ebefb44313e1f8d5a746c2/ibllib/io/extractors/ephys_fpga.py#L1184-L1195
https://github.com/int-brain-lab/ibllib/blob/fa6d722c6970ad5a29ebefb44313e1f8d5a746c2/ibllib/io/extractors/ephys_fpga.py#L949-L983