Switch `logs-page` key to snake_case

What does this MR do?

Switches from logs-page to logs_page so the frontend display a link to the logs in both embed and dashboard.

The reason is that the frontend only expects these keys:

     const endpointKeys = [
      ...
      'logsPath',
    ];

https://gitlab.com/gitlab-org/gitlab/blob/0694db97c4541bbdd6e66df452f815625ea2f3c1/app/assets/javascripts/monitoring/stores/mutations.js#L179

And only snake_keys get transformed to the camel case versions here.

This has no impact in the haml generated.

Screenshots

works here	and here!

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

Closes #201846 (closed)