Retain all query parameters when adding environment parameter to metrics dashboard URL

What does this MR do?

Metrics dashboard URLs can contain query parameters like group, title and y_label. These are usually part of the embedable panel link which can be obtained from a panel's action menu button "Copy link to chart".

Update the metrics dashboard redirect logic to retain any arbitrary query parameters that are present in the metrics dashboard URL.

Not adding a changelog since this isn't a user visible change.

Screenshots

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• 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