Remove FF expose_environment_path_in_alert_details

What does this MR do?

This MR is related to the Feature Flag Roll Out Issue to Display Environment Details in the Alert Details section:

• Issue link #232492 (closed)
• Documentation link for the feature released behind a FF with %13.5: View the Environment that generated the Alert

When merged, this MR will make the feature available to all users. The process for the rollout is defined in the Handbook section for developing with feature flags. The feature was initial shipped behind a feature flag due to these reasons.

Screenshots

A	B	C
environment is queried from graphQL	environment is queried from graphQL	environment is queried from graphQL but it's null for some reason
path is returned and it's a string	path is null for some reason
The page has the environment displayed (in the table, environment is above details)	The page looks as in B but the name of the environment is not a link	The page will not display the environment in the summary but it will have an empty row in the table

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