Add support for creating multiple replicated clusters in Bigtable hook and operator

[derrickqin]

Add support for creating multiple replicated clusters in Bigtable hook and operator

closes: #10474

Changes:

1. Added a new parameter called replica_clusters to allow creating multiple Bigtable replicated clusters
2. Made existing replica_cluster_id and replica_cluster_zone deprecated, but still working
3. Added unit tests for both hook and operator

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[boring-cyborg]

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[derrickqin]

@turbaszek @ryanyuan PTAL. Thanks!

[derrickqin]

@turbaszek could you please merge it? Thanks!

[turbaszek]

@derrickqin would you mind rebasing onto current master? There seems to be an issue with CI :<

[derrickqin]

@turbaszek could you please have another look? CI build failed on Quarantined tests, don't think it is related to my change...
Thanks!

[potiuk]

Quarantined builds fail from time to time.

[boring-cyborg]

Awesome work, congrats on your first merged pull request!

[potiuk]

Hello @derrickqin -> I believe merging that change broke our master. It's most likely not your fault, it's either some coincidence/race between your changes/master changes or a problem I described in #10471.

I am going to investigate it, but it would help tremendously if you rebase your local branch to latest master (after we merge #10522), and then re-submit the PR again - so that we could see what was the root cause of the problem ?

That would be super helpful if you do that.