Fix hardcoded URL violations

What does this MR do and why?

Related to gitlab-com/gl-infra#2017 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 fixes some of the violations. More violations will be fixed in future MRs.

References

• URLs in GitLab

Screenshots or screen recordings

See inline comments of all the changes for screenshots

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