fix(rds): serverlessV2MaxCapacity can be set to 0.5, which is invalid

[mazyu36]

Issue # (if applicable)

N/A

Reason for this change

In CFn docs, MaximumCapacity value must be higher than 0.5 ACUs.

The maximum capacity must be higher than 0.5 ACUs.

This means MaximumCapacity cannot be set to 0.5 ACUs.
However, in the CDK, serverlessV2MaxCapacity can be set to 0.5, which is invalid.

When I attempted to deploy with serverlessV2MaxCapacity set to 0.5, I encountered the following error:

CREATE_FAILED | AWS::RDS::DBCluster | Integ-Cluster (IntegCluster4261F36F) Resource handler returned message: "Serverless v2 maximum capacity 0.5 isn't valid. The maximum capacity must be at least 1.0.

In the Management Console, Maximum Capacity cannot be set to 0.5.

Description of changes

Fix a validation.

Description of how you validated changes

Fix unit tests.

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]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.17%. Comparing base (487074d) to head (595510c).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #32232   +/-   ##
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  Coverage   77.17%   77.17%           
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  Files         105      105           
  Lines        7169     7169           
  Branches     1315     1315           
=======================================
  Hits         5533     5533           
  Misses       1455     1455           
  Partials      181      181           

Flag	Coverage Δ
suite.unit	77.17% <ø> (ø)

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Components	Coverage Δ
packages/aws-cdk	77.17% <ø> (ø)

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[mazyu36]

Exemption Request: Integration tests cannot be added because only the incorrect conditional statement was fixed

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 595510c
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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[aws-cdk-automation]

The pull request linter fails with the following errors:

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