Adds resize logic to contributors graphs to handle y-scaling at various screen sizess

What does this MR do?

closes #22790 (closed)

• Replaces static height and width with preserveAspectRatio and viewBox for Contributor graphs.
• Updates CSS to better handle varying screen sizes.

I first attempted a JS-first approach, but after running into some dead ends and fighting the code a bit more than I should have, I decided to circle back to good 'ol CSS. There are some artifacts of my initial attempts left over here that I'll be removing before I remove the WIP.

Screenshots

breakpoint	sm	md	lg	xl

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• [-] Documentation created/updated or follow-up review issue created
• Code review guidelines
• [-] Merge request performance guidelines
• Style guides
• [-] Database guides
• [-] Separation of EE specific content

Performance and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• [-] Label as security and @ mention @gitlab-com/gl-security/appsec
• [-] The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• [-] Security reports checked/validated by a reviewer from the AppSec team