feat(cli): allow users to enable all feature flags that do not impact their application

[vivian12300]

Allows users to run cdk flags --safe to set all unconfigured feature flags to their recommended states without changing their CloudFormation template.

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

[codecov-commenter]

Codecov Report

❌ Patch coverage is 89.18239% with 86 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.09%. Comparing base (a9c59b7) to head (4913f0b).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/aws-cdk/lib/commands/flags/validator.ts	57.00%	33 Missing and 10 partials ⚠️
packages/aws-cdk/lib/commands/flags/operations.ts	92.19%	37 Missing and 1 partial ⚠️
packages/aws-cdk/lib/cli/cli.ts	33.33%	2 Missing ⚠️
.../aws-cdk/lib/commands/flags/interactive-handler.ts	97.61%	2 Missing ⚠️
packages/aws-cdk/lib/commands/flags/router.ts	98.48%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #798      +/-   ##
==========================================
- Coverage   83.64%   82.09%   -1.56%     
==========================================
  Files          65       71       +6     
  Lines        9558    10350     +792     
  Branches     1137     1272     +135     
==========================================
+ Hits         7995     8497     +502     
- Misses       1538     1811     +273     
- Partials       25       42      +17     

Flag	Coverage Δ
suite.unit	82.09% <89.18%> (-1.56%)	⬇️

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[rix0rrr]

Suggested change

	(flag.unconfiguredBehavesLike?.v2 !== flag.recommendedValue),
	((flag.unconfiguredBehavesLike?.v2 ?? false) !== flag.recommendedValue),

All the more reason to get this from a single place.