define-tag-after-class-definition: ignore abstract classes by default

It'd be nice to ignore abstract classes by default.
Yes, I know you have to use @typescript-eslint/parser as parser, but please. :P

edit:
Oh, you already depends on typescript-eslint, then it's easy.

Look at the rule 'define-tag-after-class-definition' in the plugin's source code. Understand how it currently detects class definitions and how to identify abstract classes using the TypeScript parser. Modify the rule to skip abstract classes by default, and test with a TypeScript file containing an abstract class.

Written by the indexing model from the issue text.