Grouping runs based on s2

[KyleQianliMa]

Short description of the changes:

This or fixes the defect of not grouping files based on s2 angle. This only applies to HYSPEC when the detector moves during experiment.

Additional tests were also added to capture this behaviour.

EWM 9809

Long description of the changes:

Check list for the pull request

• I have read the [CONTRIBUTING]
• I have read the [CODE_OF_CONDUCT]
• I have added tests for my changes
• I have updated the documentation accordingly

Check list for the reviewer

• I have read the [CONTRIBUTING]
• I have verified the proposed changes
• best software practices
  • all internal functions have an underbar, as is python standard
  • clearly named variables (better to be verbose in variable names)
  • code comments explaining the intent of code blocks
• All the tests are passing
• The documentation is up to date
• code comments added when explaining intent

Manual test for the reviewer

References

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.58%. Comparing base (81ba23b) to head (21b0c0c).
Report is 1 commits behind head on next.

Additional details and impacted files

@@            Coverage Diff             @@
##             next     #153      +/-   ##
==========================================
+ Coverage   82.33%   82.58%   +0.25%     
==========================================
  Files          39       39              
  Lines        6209     6214       +5     
==========================================
+ Hits         5112     5132      +20     
+ Misses       1097     1082      -15     

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[AndreiSavici]