chore: Cleanup unmaintained examples

[lantoli]

Proposed changes

Cleanup unmaintained examples: quickstart-mongodb-atlas, quickstart-mongodb-atlas-mean-stack-aws-fargate-integration, quickstart-mongodb-atlas-analytics-amazon-sagemaker-integration

Jira ticket: CLOUDP-342276

Please include a summary of the fix/feature/change, including any relevant motivation and context.

Link to any related issue(s):

Type of change:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as
  expected)
• This change requires a documentation update
• If changes include removal or addition of 3rd party GitHub actions, I updated our internal document. Reach out to the APIx Integration slack channel to get access to the internal document.

Manual QA performed:

• cfn invoke for each of CRUDL/cfn test
• Updated resource in example
• Published to AWS private registry
• Used the template in example to create and update a stack in AWS
• Deleted stack to ensure resources are deleted
• Created multiple resources in same stack
• Validated in Atlas UI
• Included screenshots

Required Checklist:

• I have signed the MongoDB CLA
• I have added tests that prove my fix is effective or that my feature works
• I have checked that this change does not generate any credentials and that they are NOT accidentally logged anywhere.
• I have added any necessary documentation (if appropriate)
• I have run make fmt and formatted my code
• For CFN Resources: I have released by changes in the private registry and proved by change
  works in Atlas

Further comments

[Copilot]

Pull Request Overview

This PR removes three unmaintained quickstart examples from the MongoDB Atlas CloudFormation resources repository:

• Cleanup of outdated MongoDB Atlas integration examples
• Removal of unused quickstart templates and supporting code
• Elimination of obsolete documentation and configuration files

Reviewed Changes

Copilot reviewed 52 out of 57 changed files in this pull request and generated no comments.

File	Description
quickstart-mongodb-atlas/	Complete removal of basic quickstart example including README, execution role template
quickstart-mongodb-atlas-mean-stack-aws-fargate-integration/	Full deletion of MEAN stack Fargate integration example with client/server code, Docker configs, and documentation
quickstart-mongodb-atlas-analytics-amazon-sagemaker-integration/	Complete removal of SageMaker analytics integration example including ML model code, Lambda functions, and supporting files

Files not reviewed (1)

• examples/quickstart-mongodb-atlas-mean-stack-aws-fargate-integration/fargate-example/package-lock.json: Language not supported

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[oarbusi]

Nice!