Fix rpcRetryOptions not being set in WorkflowServiceStubsOptions

[cliffsun91]

It wasn't being set in the private constructor WorkflowServiceStubsOptions(Builder builder, boolean ignore).
It also seems like the parameter ignore isn't being used?

There also doesn't seem to be any existing tests for this class / builder...

What was changed

Why?

Checklist

1. Closes

2. How was this tested:

3. Any docs updates needed?

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[cliffsun91]

Build is failing and it looks to me like it's because RpcRetryOptions$Builder.merge throws an NPE which comes from the expression Defaults.defaultValue(type).equals(options), specifically the Defaults.defaultValue(type) part where it returns null when the type is Duration.class (returns null for non-primitive) which then throws the NPE when attempting to call equals(options).

[Spikhalskiy]

Closing in favor of #972