chore: exclude test and config files from minification (#36038)

### Issue # (if applicable)

When running `yarn package` inside `aws-cdk-lib`, a pre package command is executed to minify all source files.
This command unintentionally minifies checked-in files that should not be minified, as demonstrated by the diff that is present afterwards.

<img width="514" height="204" alt="image" src="https://github.com/user-attachments/assets/67fc4c24-2345-4859-85e4-f74475bfa512" />


### Reason for this change

Fix the above bug.

### Description of changes

Adjusted the `find` command to exclude files we don't want to minify. 

### Describe any new or updated permissions being added

n/a

### Description of how you validated changes

Now no unintentionally minified files are showing up in the diff.

I have compared the outputs of the previous and updated `find` commands:
```
< ./aws-appsync/test/integ-assets/appsync-js-pipeline.js
< ./aws-appsync/test/integ-assets/appsync-js-resolver.js
< ./aws-appsync/test/integ-assets/js-resolver-assertion/index.js
< ./aws-appsync/test/verify/eventapi-lambda-direct/handler.js
< ./aws-appsync/test/verify/eventapi-lambda-ds/handler.js
< ./aws-appsync/test/verify/iam-query/iam-query.js
< ./aws-appsync/test/verify/lambda-tutorial/lambda-tutorial.js
418d410
< ./aws-cloudfront/test/function-code.js
1110d1101
< ./aws-iam/test/custom-resource/index.js
1938,1940d1928
< ./aws-synthetics/test/canaries/canary.js
< ./aws-synthetics/test/canaries/playwright/canary.js
< ./aws-synthetics/test/canaries/puppeteer/canary.js
2137d2124
< ./core/test/custom-resource-provider/mock-provider/index.js
2500d2486
< ./jest.config.js
```

As we can see, only the files we wanted to exclude are not present in the list anymore.

### Checklist
- [x] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: mrgrain

packages/aws-cdk-lib/scripts/minify-sources.sh

@@ -16,7 +16,7 @@
 scriptdir=$(cd $(dirname $0) && pwd)
 cd ${scriptdir}/..
 
-find . -name '*.js' ! -name '.eslintrc.js' ! -path '*node_modules*' | xargs npx esbuild \
+find . -name '*.js' ! -name '.eslintrc.js' ! -name 'jest.config.js' ! -path '*node_modules*' ! -path '**/test/**' | xargs npx esbuild \
   --platform=node \
   --format=cjs \
   --minify-whitespace \