Tests - find warnings & update to not use real templates

[Aryllen]

This is technically two issues, but I'm combining into one for now.

1. Find where warnings come from about name being an uninitialized column. The validate_by_study tests produce this warning.

2. Currently have the tests using real templates to check the test data on, which is tedious to maintain and not necessary to check the functionality itself. Instead, use fake annotations, templates, and test data to test validation of files/studies.

[Aryllen]

An update to 1: validate_by_study() no longer has this issue since the validation is done by dccvalidator now. Instead, combine_all_metadata() warns about specimenID.