1756 nexus generates wrong omega multipin

[rtuck99]

Fixes

• Nexus file generates wrong omega for multipin when alternating direction #1756

Note: system tests are currently skipped (it is currently not certain whether changes to imginfo are required or whether the warnings will be fixed at some point in future), imginfo raises warnings due to it not liking decreasing omega.

The fix should now result in the rotation_direction parameter in the hyperion request being applied to the omega values in the generated nexus files instead of them always increasing.

(remember to update pyproject.toml with the dodal commit tag if you need it for tests to pass!)

Instructions to reviewer on how to test:

1. Nexus files are generated with correct omega metadata in forwards and backwards directions
2. System tests pass (when above imginfo fix is applied)

Checks for reviewer

• Would the PR title make sense to a user on a set of release notes

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.09%. Comparing base (8b80655) to head (dabe14a).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1784   +/-   ##
=======================================
  Coverage   93.09%   93.09%           
=======================================
  Files         164      164           
  Lines        8985     8985           
=======================================
  Hits         8365     8365           
  Misses        620      620           

Components	Coverage Δ
i24 SSX	77.13% <ø> (ø)
hyperion	98.77% <ø> (ø)
other	98.23% <ø> (ø)

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[CoePaul]

Nit / Should :

This has been ( originally ) written to cause the reader max double vision

a much neater version would be something like

assert len(omega) = scan.num_images # same ie just to place this snippet
delta_deg = (scan.num_images - 1)
* multi_params.rotation_increment_deg
* scan.rotation_direction.multiplier
omeg_end_deg = delta_deg + scan.omega_start_deg
expected = np.linspace(scan.omega_start_deg, omega_end_deg, scan.num_images)

[rtuck99]

I've made it and the following slightly clearer