automation: part 2 of fixing flaky tests

[yonasberhe23]

Summary

Fixes #
Add intercept/waits to address

• namespace-picker failure in GA
• git repo failure in Jenkins

Checklist

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[izaac]

LGTM

[izaac]

[yonasberhe23]

The flakiness of the namespace-picker test was due to the Fleet check being in progress in a fresh Rancher install so the associated filters, such as cattle-fleet-local-system, aren't applied until after the Fleet check is complete. To fix this I updated the test to select ‘cattle-fleet-system’ instead because it exists upon user login which is more reliable.
cc: @izaac

[izaac]

Awesome, nice find