Use provided.al2 AWS Go Lambda runtime

[qsweber]

Inspired by #1677

[github-actions]

PR is now waiting for a maintainer to run the acceptance tests.
Note for the maintainer: To run the acceptance tests, please comment /run-example-tests on the PR

[Copilot]

Pull Request Overview

This PR updates the AWS Go Lambda example to use the new provided.al2 runtime, adjusts handler naming, and aligns the Pulumi AWS API call with its updated signature.

• Call aws.GetCallerIdentity with explicit args.
• Change the Lambda Function runtime to provided.al2 and Handler to bootstrap.
• Update build/zip commands in README and Makefile to output the bootstrap binary.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
aws-go-lambda-gateway/main.go	Updated GetCallerIdentity call and FunctionArgs (Handler, Runtime)
aws-go-lambda-gateway/README.md	Changed build commands to produce bootstrap binary
aws-go-lambda-gateway/Makefile	Updated build and zip steps to reference bootstrap

Comments suppressed due to low confidence (2)

aws-go-lambda-gateway/main.go:13

• [nitpick] The variable account holds the caller identity. Consider renaming it to identity or callerIdentity for clearer intent.

		account, err := aws.GetCallerIdentity(ctx, &aws.GetCallerIdentityArgs{}, nil)

aws-go-lambda-gateway/main.go:13

• The third argument (nil) passed to the variadic options in GetCallerIdentity may not compile. Either omit it or pass valid pulumi.InvokeOption values.

		account, err := aws.GetCallerIdentity(ctx, &aws.GetCallerIdentityArgs{}, nil)