[SCC-4455] Support multiple 910|a fields

[yossariano]

See https://newyorkpubliclibrary.atlassian.net/browse/SCC-4455 - this change adds support for checking multiple 910|a values for whether a bib/item is meant for research, instead of just the first value in the field.

Testing

• Updated tests to include a fixture with both BL and RL in the 910|a field.

[charmingduchess]

I'm also not seeing any prior unit tests for this method. I think it would be a good idea to add some edge case coverage for isOtfRecord or maybe updating these suppression tests.

[yossariano]

I'm also not seeing any prior unit tests for this method. I think it would be a good idea to add some edge case coverage for isOtfRecord or maybe updating these suppression tests.

It is implicitly tested with this test (it failed with multiple 910|a fields previously):

  prefilter
    filteredSierraBibsForBibs
      1) should keep Research bibs

but I'm adding more explicit testing now!