Y24-385 - scRNA - update use of tube racks in sample manifest code

[andrewsparkes]

User story As scRNA developers we need to check and update the code in the sample manifest upload to match the new concepts for tube rack instances and barcode metadata.

Who are the primary contacts for this story PSD scRNA devs

Who is the nominated tester for UAT Abby C

Acceptance criteria To be considered successful the solution must allow:

• [ ] check and modify if needed file app/sample_manifest_excel/sample_manifest_excel/upload/processor/tube_rack.rb

Dependencies This story is blocked by the following dependencies: None

References This story has a non-blocking relationship with: Other tube rack stories e.g. y24-099

Additional context It looks like it needs to create a new instance rather than re-use the previous one found by barcode.