Lambda Deploy automatically creates a new version and no option to disable that

## Problem

When deploying modified Lambda code, it automatically creates a new version in the console and there is no option to disable that feature. I want the deploy to change $latest only. not create new version each time.

## Steps to reproduce the issue

1. download a lambda fn
2. make some changes
3. click deploy on the auto-prompted dialog
4. visit aws lambda functions -> versions
5. you can see a new version is created

## Expected behavior

1. it should not create new version until I manually specified
2. should only make changes to $latest only.

## System details (run `AWS: About` and/or `Amazon Q: About`)

OS: Darwin arm64 24.6.0
Visual Studio Code extension host: 1.106.1
AWS Toolkit: 3.88.0
node: 22.20.0
electron: 37.7.0

Reproduce the deployment flow in the AWS Toolkit for VS Code using the listed macOS, VS Code, and Toolkit versions: modify a downloaded Lambda function, deploy it, and inspect AWS Lambda versions. Trace the Lambda deploy entry point and confirm that the completed behavior updates $latest without creating a new version unless the user explicitly requests one.

Written by the indexing model from the issue text.