feat(ec2-alpha): ec2-alpha module is now in Developer Preview

[shikha372]

Issue # (if applicable)

Tracking #30762.

Reason for this change

Moving alpha module for VpcV2 construct to developer-preview.

Description of changes

Set maturity to developer-preview and update the README stability banner for ec2-alpha module.

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

---

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[aws-cdk-automation]

(This review is outdated)

✅ Updated pull request passes all PRLinter validations. Dismissing previous PRLinter review.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.84%. Comparing base (578debf) to head (a3ea2a9).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #33230   +/-   ##
=======================================
  Coverage   80.84%   80.84%           
=======================================
  Files         232      232           
  Lines       14135    14135           
  Branches     2460     2460           
=======================================
  Hits        11428    11428           
  Misses       2427     2427           
  Partials      280      280           

Flag	Coverage Δ
suite.unit	80.84% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
packages/aws-cdk	79.64% <ø> (ø)
packages/aws-cdk-lib/core	82.17% <ø> (ø)

[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: a3ea2a9
• Result: SUCCEEDED
• Build Logs (available for 30 days)

Powered by github-codebuild-logs, available on the AWS Serverless Application Repository

[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[github-actions]

Comments on closed issues and PRs are hard for our team to see.
If you need help, please open a new issue that references this one.