chore(rds): clusterScailabilityType is spelled wrong and should be clusterScalabilityType

[iankhou]

Issue #32415

Closes #32415 .

Reason for this change

Misspelling of the ClusterScalabilityType type, enum, and prop.

Description of changes

Deprecated misspellings of ClusterScailabilityType/clusterScailabilityType and aliased the misspelling for backwards compatibility. The misspelled name will be removed in the next MV release.

Describe any new or updated permissions being added

No permissions changes.

Description of how you validated changes

Added unit tests for the new spelling (ClusterScalabilityType/clusterScalabilityType), and kept unit tests that tested the misspelling.

# in packages/aws-cdk-lib
yarn test aws-rds

Ran the relevant integration test.

# in packages/@aws-cdk-testing/framework-integ
yarn integ test/aws-rds/test/integ.cluster-limitless.js

Ran Rosetta to verify README changes.

./scripts/run-rosetta.sh

No complications from README changes in these commits.

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 (f63ec29) to head (facddcd).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #32825   +/-   ##
=======================================
  Coverage   81.52%   81.52%           
=======================================
  Files         222      222           
  Lines       13717    13717           
  Branches     2417     2417           
=======================================
  Hits        11183    11183           
  Misses       2254     2254           
  Partials      280      280           

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

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Components	Coverage Δ
packages/aws-cdk	80.98% <ø> (ø)
packages/aws-cdk-lib/core	82.09% <ø> (ø)

[aws-cdk-automation]

AWS CodeBuild CI Report

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