add(sdk/go): Context to workflow requests (#2765)

[gregfurman]

Description

Fixes #2765

Methods on the AdminClient interface ignore the caller method's context.Context parameter, meaning cancelling a parent context fails to affect the downstream gRPC request.

This PR introduces breaking changes to the interface which now correctly pass a caller context to these methods.

Rationale for breaking changes

The two alternatives considered for this were:

• Adding a context.Context parameter to the request options, allowing it to be retrieved from a seperate struct without changing the method signature -- like with http/net introducing a NewRequestWithContext (see https://go.dev/blog/context-and-structs#exception-to-the-rule-preserving-backwards-compatibility)
• Introducing corresponding [Action]Context methods on the interface (i.e RunWorkflowContext) in a similar manner to database/sql's Query(...) and QueryContext(ctx context.Context, ...) (see https://go.dev/blog/module-compatibility#adding-to-a-function)

However, the interface being changed is both in a deprecated package (which IMO should mean less stability guarantees) AND should probably have had these ctx params to begin with.

With that said, if we choose to accept this PR, we should make mention of this breaking change to the SDK in the release notes.

Type of change

• Breaking change (fix or feature that would cause existing functionality to not work as expected)

What's Changed

• Adds a context.Context to those methods within the (deprecated) v0 AdminClient interface.
• Calls made without proper context propagation now use context.TODO() instead of a no-op context.Background()

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📝 Documentation updates detected!

Updated existing suggestion: Update Go migration guide for V0 SDK deprecation and context parameter breaking change

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[promptless-for-oss]

📝 Documentation updates detected!

Updated existing suggestion: Add V0 and V1 Generics SDK deprecation notices to Go migration guide

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