feat(cx-api): declare support for CDK_TOOLKIT_VERSION env var

[mrgrain]

Reason for this change

CDK apps have access to an informative env variable, containing the version of the CLI running the app. With the release of the CDK Toolkit Library, this value does not always represent what it should. As a future replacement, we are introducing a new env variable that will contain the version and package name of the package

Description of changes

Add a new env var name to cx-api to support a generic toolkit version. This value will contain the package name and version:

"@x.y.z", e.g "[email protected]" or "@aws-cdk/[email protected]"

Describe any new or updated permissions being added

n/a

Description of how you validated changes

n/a

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(This review is outdated)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.38%. Comparing base (e5f71db) to head (b4ad8a6).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #33963   +/-   ##
=======================================
  Coverage   82.38%   82.38%           
=======================================
  Files         120      120           
  Lines        6955     6955           
  Branches     1173     1173           
=======================================
  Hits         5730     5730           
  Misses       1120     1120           
  Partials      105      105           

Flag	Coverage Δ
suite.unit	82.38% <ø> (ø)

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Components	Coverage Δ
packages/aws-cdk	∅ <ø> (∅)
packages/aws-cdk-lib/core	82.38% <ø> (ø)

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

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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: b4ad8a6
• Result: SUCCEEDED
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