Swap out hardcoded URLs for JavaScript path helpers

What does this MR do and why?

Related to gitlab-org#20345 (closed) and gitlab-org#21276

We are trying to fix violations of the no-hardcoded-urls ESLint rule to fix URL related bugs and make our codebase more consistent. This MR uses JavaScript path helpers to replace hardcoded URLs in the directories that grouporganizations own. Other parts of the codebase will be completed in other MRs.

References

• gitlab-org#20345 (closed)
• gitlab-org#21276

Screenshots or screen recordings

See inline code comments

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