CMR-10186: Handling case when collections query parameter is a comma separated string

[william-valencia]

CMR-STAC was passing the collections query parameter as is to graphQL which resulting in a comma separated string as an entryID, ie: "entryId": [ "HLSS30_2.0,HLSL30_2.0" ]. In this case CMR-STAC would return nothing.
This needs to be split properly so that the field passed the graphQL would be of the form "entryId": [ "HLSS30_2.0", "HLSL30_2.0" ]

Example GET Requests:
https://cmr.earthdata.nasa.gov/stac/LPCLOUD/search?collections=HLSS30_2.0,HLSL30_2.0
http://localhost:3000/stac/LPCLOUD/search?collections=HLSS30_2.0,HLSL30_2.0

Specifying multiple collections in this manner should return the proper results

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.36%. Comparing base (2449123) to head (1875fee).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #357      +/-   ##
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+ Coverage   88.34%   88.36%   +0.01%     
==========================================
  Files          24       24              
  Lines        1167     1169       +2     
  Branches      256      257       +1     
==========================================
+ Hits         1031     1033       +2     
  Misses        136      136              

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[macrouch]

Is it possible for the list of entry IDs to have a space after the comma? Instead of coll_v1,coll_v2, could it come in as coll_v1, coll_v2?

If so, does the code correctly handle that?

[william-valencia]

Is it possible for the list of entry IDs to have a space after the comma? Instead of coll_v1,coll_v2, could it come in as coll_v1, coll_v2?

If so, does the code correctly handle that?

The STAC spec says their should be no whitespaces between values.
https://github.com/radiantearth/stac-api-spec/tree/release/v1.0.0/item-search#query-parameters-and-fields