chore(toolkit): trim whitespace from IoMessages

[mrgrain]

Reason for this change

After removing emojis and ANSI colors, an IoMessage might end up with floating whitespace at either end. We want to trim this whitespace.

Description of changes

Always trim whitespace from IoMessages.

Describe any new or updated permissions being added

n/a

Description of how you validated changes

unit 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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.80%. Comparing base (9a0e1ad) to head (ae2a168).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #33284   +/-   ##
=======================================
  Coverage   80.80%   80.80%           
=======================================
  Files         236      236           
  Lines       14235    14235           
  Branches     2487     2487           
=======================================
  Hits        11503    11503           
  Misses       2448     2448           
  Partials      284      284           

Flag	Coverage Δ
suite.unit	80.80% <ø> (ø)

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Components	Coverage Δ
packages/aws-cdk	79.57% <ø> (ø)
packages/aws-cdk-lib/core	82.14% <ø> (ø)

[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: ae2a168
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

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