Verify the upgrade time of klusterlet/addon on hub with 2000 clusters

Value Statement

This to check the upgrade of klusterlet/addons on large scale environment

Definition of Done for Engineering Story Owner (Checklist)

collect data that includes

• average upgrade time per cluster 
• average upgrade time per klusterlet
• average upgrade time per addon

we also should have a CDF diagram on this

Tests Automated

• [ ] Unit/function tests have been automated and incorporated into the
  build.
• [ ] 100% automated unit/function test coverage for new or changed APIs.

Secure Design

• [ ] Security has been assessed and incorporated into your threat model.

Multidisciplinary Teams Readiness

• [ ] Create an informative documentation issue using the [Customer
  Portal_doc_issue template](
  https://github.com/stolostron/backlog/issues/new?assignees=&labels=squad%3Adoc&template=doc_issue.md&title=),
  and ensure doc acceptance criteria is met. Link the development issue to
  the doc issue.
• [ ] Provide input to the QE team, and ensure QE acceptance criteria
  (established between story owner and QE focal) are met.

Support Readiness

• [ ] The must-gather script has been updated.