feat(redshift): supports excludeCharacters settings for DatabaseSecret

[mazyu36]

Issue # (if applicable)

Closes #26847.

Reason for this change

In the case of passwords generated by DatabaseSecret, there may be a need to exclude certain characters.

The original issue was to exclude the backtick character from passwords.
However, the current default value of excludeCharacters, '"@/\ '', matches the characters that are not supported in Redshift (docs).

It can use any ASCII characters with ASCII codes 33–126, except ' (single quotation mark), " (double quotation mark), , /, or @.

Instead of including the backtick in the default value of excludeCharacters, it was considered appropriate to make it configurable.

Description of changes

Add excludeCharacters property to specify characters to not include in generated passwords.

Description of how you validated changes

Add unit tests and integ tests.

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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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

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: ea3ebfb
• Result: SUCCEEDED
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