Divide KCP upgrade e2e test into multiple tests

[sedefsavas]

KCP upgrade tests include 2 HA cluster upgrade tests which takes too long for providers.

For the providers that parallelize their e2e tests, calling a time-consuming cluster-api test spec reduces the parallelization benefits. Instead dividing these tests will allow providers to choose which test to call and parallelise accordingly.

I propose to place scale-in-rollout test to a separate spec.

[sedefsavas]

cc @jan-est

[jan-est]

Thanks @sedefsavas
Is there anyone in the community who could like work on this one right away?

[fabriziopandini]

/kind feature
/area testing
/milestone v0.4
(setting milestone 0.4 given it seems that the sooner the better)

[fabriziopandini]

/help

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[tcordeu]

I can work on this one! @fabriziopandini @jan-est

[tcordeu]

I am going to go ahead and assign myself, If anyone is already working on it feel free to unassign me.

/assign @tcordeu

[fabriziopandini]

/lifecycle active