Follow-up on improving Fleet performance

[aruiz14]

Follow-up of #12424, where a few areas of improvement were identified but was mainly focused on the resources table, which suffered the biggest slowdown.

Setup

• Rancher version: 2.9 - 2.10

Describe the bug
See original issue for details.

Additional context
Areas of improvement:

• Continuous Delivery dashboard iterates over all bundles and clusters multiple times per repository (for calculating the badge, tooltip, etc.)
  • This information is already available in the GitRepo resource status
• While resourcesStatuses was improved as part of the original issue, clusterResourceStatus is still inefficient.
  • Many of it usages use find to pick only one cluster. We need to review and address them.
• Cluster details pages iterate over all clusters, to later filter by the one being displayed, which is not ideal.