chore(cx-api): only include v1 feature flags in the Flags with a different default in v2 section

[gracelu0]

Issue # (if applicable)

Closes #.

Reason for this change

The docs listing feature flags in v1 with a different default in v2 currently includes some feature flags that were introduced in v2: https://github.com/aws/aws-cdk/blob/main/packages/aws-cdk-lib/cx-api/FEATURE_FLAGS.md#flags-with-a-different-default-in-v2 .

Description of changes

Update the filter to check if the feature flag was introduced in v1 to avoid accidentally including v2 feature flags with default
true.

Describe any new or updated permissions being added

N/A

Description of how you validated changes

ran yarn build to update FEATURE_FLAGS.md

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.52%. Comparing base (ed366ce) to head (a6ec413).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #32766   +/-   ##
=======================================
  Coverage   81.52%   81.52%           
=======================================
  Files         222      222           
  Lines       13715    13715           
  Branches     2417     2417           
=======================================
  Hits        11181    11181           
  Misses       2254     2254           
  Partials      280      280           

Flag	Coverage Δ
suite.unit	81.52% <ø> (ø)

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

Components	Coverage Δ
packages/aws-cdk	80.97% <ø> (ø)
packages/aws-cdk-lib/core	82.09% <ø> (ø)

[gracelu0]

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[mergify]

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[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: a6ec413
• Result: SUCCEEDED
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