useragent: Simplify data structure, context helpers

[jar-b]

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Description

The final design for provider_meta support in the standard and AWSCC provider contains a user_agent argument which is a list of strings. Once the AWSCC provider reaches version 2.0.0 and the list of objects user_agent schema is replaced with a list of strings, all upstream libraries will have simplified the representation of additional User-Agent values to string types.

This simplification means that the data structures in this library for representing User-Agent data can also be simplified. This includes.

• Data structures in internal/config:

aws-sdk-go-base/internal/config/user_agent.go

Lines 10 to 16 in d2c7d8d

	type UserAgentProduct struct {
	Name string
	Version string
	Comment string
	}
	type UserAgentProducts []UserAgentProduct

• Context helpers in useragent:

aws-sdk-go-base/useragent/context.go

Lines 18 to 20 in d2c7d8d

	func Context(ctx context.Context, products config.UserAgentProducts) context.Context {
	return context.WithValue(ctx, contextScopedUserAgent, products)
	}

These types and function arguments can be replaced with a slice of strings, aligning with the upstream representation.

References

https://hashicorp.github.io/terraform-provider-aws/design-decisions/provider_meta/
Relates hashicorp/terraform-provider-aws#45464
Relates hashicorp/terraform-provider-awscc#474