chore(tests): temporarily disable E2E parallelism

[heitorlessa]

Issue number: #3463

Summary

This PR temporarily disables parallelism to gain release confidence all tests pass. It will add ~18 extra minutes for each run until we investigate deeply.

After merging 35fb001, E2E tests stopped working consistently. While they pass most tests, they never completed successfully anymore.

It almost looks like a packaging issue since that PR had to change to the latest manylinux distro for C-extension wheels.

 jsii.errors.JavaScriptError: 
  Error: ENOENT: no such file or directory, lstat '/home/runner/work/powertools-lambda-python/powertools-lambda-python/cdk.out/layer_build/python/pydantic/sttOUWvt'
      at Object.lstatSync (node:fs:1514:3)
      at _processFileOrDirectory (/tmp/jsii-kernel-jftarp/node_modules/aws-cdk-lib/core/lib/fs/fingerprint.js:2:1093)
      at _processFileOrDirectory (/tmp/jsii-kernel-jftarp/node_modules/aws-cdk-lib/core/lib/fs/fingerprint.js:2:1685)
      at _processFileOrDirectory (/tmp/jsii-kernel-jftarp/node_modules/aws-cdk-lib/core/lib/fs/fingerprint.js:2:1685)
      at _processFileOrDirectory (/tmp/jsii-kernel-jftarp/node_modules/aws-cdk-lib/core/lib/fs/fingerprint.js:2:1685)
      at fingerprint (/tmp/jsii-kernel-jftarp/node_modules/aws-cdk-lib/core/lib/fs/fingerprint.js:2:870)
      at Function.fingerprint (/tmp/jsii-kernel-jftarp/node_modules/aws-cdk-lib/core/lib/fs/index.js:1:2771)
      at AssetStaging.calculateHash (/tmp/jsii-kernel-jftarp/node_modules/aws-cdk-lib/core/lib/asset-staging.js:2:1396)
      at AssetStaging.stageByCopying (/tmp/jsii-kernel-jftarp/node_modules/aws-cdk-lib/core/lib/asset-staging.js:1:3881)
      at stageThisAsset (/tmp/jsii-kernel-jftarp/node_modules/aws-cdk-lib/core/lib/asset-staging.js:1:2788)

Changes

• Use pytest tests/e2e to run all tests serially instead of parallel_run.py
• Upgrade to nodejs 20.x to remove CDK deprecation warnings from logs

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User experience

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Checklist

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• Meet tenets criteria
• I have performed a self-review of this change
• Changes have been tested
• Changes are documented
• PR title follows conventional commit semantics

Is this a breaking change?

RFC issue number:

Checklist:

• Migration process documented
• Implement warnings (if it can live side by side)

Acknowledgment

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[sonarqubecloud]

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3.0% Duplication