[js-api-parser] Implemented a simple `intersperse` helper

[KarishmaGhiya]

Two Tasks:

Task 1:
Implemented a simple intersperse helper we could use that instead of doing the same check everywhere.

The idea would be:

const typeParameterTokens = typeParameters.map(<logic to map to review tokens>).intersperse(createToken(TokenKind.Text, ",", { hasSuffixSpace: true, deprecated }))

Or something along those lines. Not for this PR, but we could do a cleanup pass separately

The basic idea:

1. Build an array of ReviewToken
2. call intersperse getting a new array
3. tokens.push(result of [2])

Originally posted by @maorleger in #13453 (comment)

Task 2:

let copilot extract a helper function and centralize this typeParameter rendering logic. #13516 (comment)