Ensure transient embeds cache correctly

What does this MR do?

!28618 (merged) introduced metrics embeds defined through query params for the embed request. The caching for this dashboard didn't respect the query params. This MR updates transient embeds to respect the appropriate query params.

Screenshots

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry - bug fix within the current milestone
• [-] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• [-] Separation of EE specific content

Availability 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
• [-] Informed Infrastructure department of a default or new setting change, if applicable per definition of done

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