Reintroduce the marc_resource logic reverted earlier (#1273).

[bwatson78]

• lib/traject/extract_marc_resource.rb: removes "not indicator2 == 2" logic and uses the reworked method to determine fulltext links.
• lib/traject/extraction_tools.rb: the reworked supplemental text values.
• spec/fixtures/alma_marc_resource.xml: adds in new testing values.
• spec/models/marc_indexing_spec.rb: adds in tests, but also removes a test that is no longer valid:
  • "and 000/6 == e, f, g, k, o, or r and 008/29 != o or s": this now gets a Online status, which negates the At Library logic.