Fix TestAccContainerCluster_withReleaseChannelEnabled test

[rileykarson]

No description provided.

[rileykarson]

I took a look at this and don't have a great solution- we test upgrading between release channels, but it's an impossible transition right now. The STABLE and REGULAR channel are 2 minor versions apart, which is an impossible transition (you can only upgrade a single minor version at a time).

This doesn't have much to do with release channels- we actually turn the feature off to perform the transition. We could consider handling big version jumps natively in the provider by selecting appropriate intermediary GKE versions, but that's likely undesirable. The logic would be brittle, and TF choosing arbitrary (temporary) minor versions could be an anti-feature. Instead, we could consider removing the update mechanics from the test- unfortunate, since it stops testing a complex interaction- but will make the test pass again.

[ghost]

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