fix(core): remove whitespaces in tree.json

[sorawee]

Issue # (if applicable)

Relates to #27261

Reason for this change

Makes it possible to synthesize our CDK application, which errors due to tree.json hitting 512mb, which is node's max string size.

Description of changes

tree.json can grow too large to be serialized, as detailed in #27261. One reason why the file is very large is that the serialization uses indentation space of 2. Removing the whitespace from serialization will return a lot of spaces, and it is a very straightforward change. This is OK to do because the file is not meant to be read by human anyway. This PR implements the solution.

Ideally, in the future we should also make it possible to split tree.json into multiple files or use the solution in bmoffatt@91edfec, to make it scalable. At that stage, it's also possible to turn indentation space back to 2 (perhaps to aid debugging).

For now, however, this issue is blocking the deployment in our team, and we really need this fix to continue.

Describe any new or updated permissions being added

No permission involved.

Description of how you validated changes

Does not affect any functionality.

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]

(This review is outdated)

[rix0rrr]

I am fine with this change, but it doesn't solve the issue yet.

✅ Updated pull request passes all PRLinter validations. Dismissing previous PRLinter review.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.38%. Comparing base (ab6ba09) to head (d4e9fe5).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #33784   +/-   ##
=======================================
  Coverage   82.38%   82.38%           
=======================================
  Files         120      120           
  Lines        6937     6937           
  Branches     1170     1170           
=======================================
  Hits         5715     5715           
  Misses       1119     1119           
  Partials      103      103           

Flag	Coverage Δ
suite.unit	82.38% <ø> (ø)

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Components	Coverage Δ
packages/aws-cdk	∅ <ø> (∅)
packages/aws-cdk-lib/core	82.38% <ø> (ø)

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Pull request has been modified.

[sorawee]

Thanks, @rix0rrr! I rebased as mergify suggested, and also reworded "fixes ..." in the commit message to "relates to ..." in the latest revision. Let me know if there's anything else I should do!

[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: 27f80ae
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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