chore: extract Bigtable to https://github.com/googleapis/java-bigtable

[kolea2]

Also fixes #6686

[igorbernstein2]

Lgtm

[codecov]

Codecov Report

Merging #6801 into master will increase coverage by 0.36%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             master    #6801       +/-   ##
=============================================
+ Coverage     45.27%   45.64%    +0.36%     
- Complexity     6249    27067    +20818     
=============================================
  Files           453     2522     +2069     
  Lines         56280   282440   +226160     
  Branches       7229    33493    +26264     
=============================================
+ Hits          25481   128916   +103435     
- Misses        29141   143440   +114299     
- Partials       1658    10084     +8426

Impacted Files	Coverage Δ	Complexity Δ
...b/GrpcAutoscalingPolicyServiceCallableFactory.java	37.5% <0%> (ø)	3% <0%> (?)
...loud/vision/v1p1beta1/stub/ImageAnnotatorStub.java	50% <0%> (ø)	1% <0%> (?)
.../cloud/dialogflow/v2/SessionEntityTypesClient.java	59.78% <0%> (ø)	23% <0%> (?)
...ta2/stub/GrpcClusterControllerCallableFactory.java	50% <0%> (ø)	4% <0%> (?)
...eta2/stub/WorkflowTemplateServiceStubSettings.java	83.96% <0%> (ø)	19% <0%> (?)
...ogle/cloud/compute/v1/RegionInstanceGroupList.java	31.25% <0%> (ø)	8% <0%> (?)
...e/cloud/compute/v1/ListSubnetworksHttpRequest.java	24.33% <0%> (ø)	11% <0%> (?)
...le/cloud/compute/v1/stub/NodeTypeStubSettings.java	75.53% <0%> (ø)	13% <0%> (?)
...gle/cloud/compute/v1/MetadataFilterLabelMatch.java	0% <0%> (ø)	0% <0%> (?)
.../com/google/cloud/compute/v1/NodeTypeSettings.java	23.52% <0%> (ø)	3% <0%> (?)
... and 2155 more

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