feat: deprecate v1beta1 client endpoint is turned down

[chingor13]

Endpoint was turned down 2020-09-28

Fixes #481

[generated-files-bot]

Warning: This pull request is touching the following templated files:

• google-cloud-asset/src/main/java/com/google/cloud/asset/v1beta1/AssetServiceClient.java
• google-cloud-asset/src/main/java/com/google/cloud/asset/v1beta1/AssetServiceSettings.java
• google-cloud-asset/src/main/java/com/google/cloud/asset/v1beta1/package-info.java
• google-cloud-asset/src/main/java/com/google/cloud/asset/v1beta1/stub/AssetServiceStub.java
• google-cloud-asset/src/main/java/com/google/cloud/asset/v1beta1/stub/AssetServiceStubSettings.java
• google-cloud-asset/src/main/java/com/google/cloud/asset/v1beta1/stub/GrpcAssetServiceCallableFactory.java
• google-cloud-asset/src/main/java/com/google/cloud/asset/v1beta1/stub/GrpcAssetServiceStub.java
• grpc-google-cloud-asset-v1beta1/src/main/java/com/google/cloud/asset/v1beta1/AssetServiceGrpc.java

[codecov]

Codecov Report

Merging #493 (6d31b13) into master (1509270) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #493   +/-   ##
=========================================
  Coverage     73.57%   73.57%           
  Complexity      275      275           
=========================================
  Files            36       36           
  Lines          2176     2176           
  Branches         11       11           
=========================================
  Hits           1601     1601           
  Misses          556      556           
  Partials         19       19           

Impacted Files	Coverage Δ	Complexity Δ
...google/cloud/asset/v1beta1/AssetServiceClient.java	40.00% <ø> (ø)	7.00 <0.00> (ø)
...ogle/cloud/asset/v1beta1/AssetServiceSettings.java	21.21% <ø> (ø)	2.00 <0.00> (ø)
...gle/cloud/asset/v1beta1/stub/AssetServiceStub.java	20.00% <ø> (ø)	1.00 <0.00> (ø)
...d/asset/v1beta1/stub/AssetServiceStubSettings.java	84.92% <ø> (ø)	12.00 <0.00> (ø)
.../v1beta1/stub/GrpcAssetServiceCallableFactory.java	50.00% <ø> (ø)	4.00 <0.00> (ø)
...cloud/asset/v1beta1/stub/GrpcAssetServiceStub.java	86.56% <ø> (ø)	10.00 <0.00> (ø)

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