Link cluster index page to cluster show page

What does this MR do?

We recently added a new cluster agent page. See MR: !54106 (merged)

See related issue: #321702 (closed)

Right now, there is no way for a user to navigate to the new page.

This MR will

• Update cluster_list GraphQl to query webPath for the new page
• Update cluster_list table so a link to the new page is displayed to the user
• Update associated tests

Review app

(may go down)

https://gitlab-review-298748-age-6cq7fl.gitlab-review.app/root/agent-link-test/-/clusters

Screenshots (strongly suggested)

link

Does this MR meet the acceptance criteria?

Conformity

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• Documentation (if required)
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• 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

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• 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

Related to #298748 (closed)