Embed specific metrics chart in issue

What does this MR do?

Makes single metric embeds separated by a comma appear side by side.

Desktop:

Medium size:

This MR depends on two other MRs.

• #31304 - This is the backend piece that allows us to use a single metric URL.
  To verify the functionality that this MR provides, this MR must be checked out/merged.
• #31339 generates the sharable link.

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry for user-facing changes, or community contribution. Check the link for other scenarios.
• 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

Closes #62971 (closed)