chore: revert ensure docker file runs as non root user

[GavinZZ]

Reverts #32976

After discussing with team, I'm going to revert the original PR.

This is because we notice that CDK when bundling supports the following feature: https://docs.aws.amazon.com/cdk/api/v2/python/aws_cdk.aws_lambda_nodejs/ICommandHooks.html

beforeBundling: Commands in this hook run before the bundling process begins, outside the Docker container. These are executed on the local machine.
beforeInstall: Commands in this hook run inside the Docker container before npm install or npm ci commands are executed.
afterBundling: Commands in this hook run inside the Docker container after the bundling process completes.

This means that users can provide custom commands to run inside the docker container and we do not know what current users run. They could provide a command that require root access and this will be a regression once released.

[mrgrain]

@GavinZZ Best to add a note why it was reverted.

[GavinZZ]

@mrgrain thanks for the reminder, I added reasoning to the revert.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.39%. Comparing base (d8cd4bd) to head (a7efcd6).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #33004   +/-   ##
=======================================
  Coverage   81.39%   81.39%           
=======================================
  Files         225      225           
  Lines       13714    13714           
  Branches     2411     2411           
=======================================
  Hits        11162    11162           
  Misses       2277     2277           
  Partials      275      275           

Flag	Coverage Δ
suite.unit	81.39% <ø> (ø)

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Components	Coverage Δ
packages/aws-cdk	80.70% <ø> (ø)
packages/aws-cdk-lib/core	82.10% <ø> (ø)

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• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: a7efcd6
• Result: SUCCEEDED
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