[K9VULN-2349] Implement test file detection for TypeScript

[jasonforal]

What problem are you trying to solve?

The analyzer doesn't accurately classify TypeScript files that contain or are related to tests.

What is your solution?

• Modify the JavaScript classifier to be generalized and implement a TypeScript classifier with the same underlying logic. See: 12eda62
• Detected libraries are equivalent to that of the JavaScript classifier implemented by [K9VULN-2348] Implement test file detection for JavaScript #585.

Alternatives considered

What the reviewer should know

• Ctrl+C and Ctrl+V of the unit test data and changing the file extensions isn't an ideal solution, but it's quick and good enough.