Add glm_ query string parameters to trial URLs

What does this MR do?

Add glm_ query string parameters to trial URLs

Main issue #119083 (closed)

Screenshots

glm_source	glm_content	Location	Image
gitlab.com	gold-callout	Gold callout
gitlab.com	top-right-dropdown	Top right drop down
gitlab.com	security-paywall	Security paywall
gitlab.com	group-billing	Group billing (CTA located between group name and tiers) /groups/group111111/-/billings
gitlab.com	user-billing	User billing /profile/billings

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

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