[Automation] - Stabilize imported generic cluster e2e spec

[izaac]

Summary

Fixes: rancher/qa-tasks#2317

Depends on: rancher/qa-infra-automation#111

Occurred changes and/or fixed issues

Fix flakiness on imported cluster create against Prime Rancher and wrap cluster manager tests with their Qase case IDs:

• accept Pending as a transient state alongside Provisioning/Waiting
• select provider column by .col-cluster-provider (formatter-derived)
• wait for cluster list visibility before masthead/list interactions
• extend cluster detail registration page wait to medium timeout
• disable Cypress retries on create to avoid stale clusters
• wrap eligible it() statements with qase() using the oldest matching Qase case ID per title

Areas or cases that should be tested

Jenkins

Areas which could experience regressions

Jenkins CI

Screenshot/Video

PRIME

COMMUNITY

Checklist

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[yonasberhe23]

LGTM!