feat(ec2-alpha): Transit Gateway L2

[paulhcsun]

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Closes #.

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Describe any new or updated permissions being added

Description of how you validated changes

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]

The pull request linter has failed. See the aws-cdk-automation comment below for failure reasons. If you believe this pull request should receive an exemption, please comment and provide a justification.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.40%. Comparing base (bb59b5a) to head (a76835c).
Report is 67 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #32956      +/-   ##
==========================================
- Coverage   81.52%   81.40%   -0.12%     
==========================================
  Files         222      223       +1     
  Lines       13715    13727      +12     
  Branches     2417     2411       -6     
==========================================
- Hits        11181    11175       -6     
- Misses       2254     2274      +20     
+ Partials      280      278       -2     

Flag	Coverage Δ
suite.unit	81.40% <ø> (-0.12%)	⬇️

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

Components	Coverage Δ
packages/aws-cdk	80.74% <ø> (-0.24%)	⬇️
packages/aws-cdk-lib/core	82.10% <ø> (+<0.01%)	⬆️

[aws-cdk-automation]

The pull request linter fails with the following errors:

❌ Features must contain a change to a README file.
❌ The first word of the pull request title should not be capitalized. If the title starts with a CDK construct, it should be in backticks "``".

PRs must pass status checks before we can provide a meaningful review.

If you would like to request an exemption from the status checks or clarification on feedback, please leave a comment on this PR containing Exemption Request and/or Clarification Request.

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 9c0bf44
• Result: FAILED
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