Re-organize test file tags

[LakiG]

The tags need to be re-organized as discussed here.

To Do

• Remove name field from test files and test schema. Use the test file/path name as the unique tag for each test.
• Remove all tags for individual tests and use schema_validation_only tag instead of the logical tag.
• Allow only letters, digits and underscores in tag names. The current --tag CLI arg needs to be repeated for multiple tags. It is also wrapped around quotes to support spaces in tag names. Use a more user-friendly syntax such as --tag tag1,tag2,tag3