test(bundlers): add e2e test for bundler tree-shaking

[kuhe]

Issue

n/a

Description

PR adds a test to the e2e group, though it does not call AWS.
The test generates two browser bundles of S3 with a single Command using both vite (rollup at the moment) and webpack. The test asserts that the bundle contents are properly tree-shaken, used the correct browser file-replacements, and are not excessively large.

Testing

running the test in the PR

Additional context

sometimes subtle changes can cause treeshaking bailout, especially by webpack.

We have a size benchmark module, but it is non-blocking and hasn't updated many of its packages: https://github.com/aws/aws-sdk-js-v3/blob/main/benchmark/size/report.md

Checklist

• [n/a] If the PR is a feature, add integration tests (*.integ.spec.ts).
• If you wrote E2E tests, are they resilient to concurrent I/O?
• [n/a] If adding new public functions, did you add the @public tag and enable doc generation on the package?

[github-actions]

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