Reinstate 60s timeout in Cluster Prometheus

What does this MR do?

Refs #232786

This does the same thing as !39318 (merged), but I missed a case in that MR, which is the Applications::Cluster::Prometheus wrapper which holds its own PrometheusClient instance and creates long running DeploymentQuerys.

In short, we are in the process of rolling out a feature flag (see linked issue ref) that will set stricter timeouts for any outbound HTTP requests. However, some parts of the application send requests that time out on the new defaults. I am therefore reinstating the previous 60s timeout explicitly in those to unblock the feature toggle. Eventually we should fix the root causes, which are the underlying slow queries to Prometheus.

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