[LIMS-2099] Return cassette position for data collection group

[gfrn]

JIRA ticket: LIMS-2099

Summary:

Since more data is being inserted into SCAUP, more DCGs have cassette positions associated with them. Since the comments column is not being used all that often, it would be useful to replace it with the cassette position

Changes:

• Return cassette position for data collection group

To test:

Assuming you have ispyb-restore mounted:

• Send a GET request to https://local-oidc-test.diamond.ac.uk:9000/api/proposals/bi37584/sessions/8/dataGroups?page=0&limit=20&search=, check if both items have cassette positions associated with them

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.80%. Comparing base (c9102e3) to head (f4dd525).

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #23   +/-   ##
=======================================
  Coverage   94.80%   94.80%           
=======================================
  Files          46       46           
  Lines        1887     1888    +1     
=======================================
+ Hits         1789     1790    +1     
  Misses         98       98           

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