feat(xml-builder): use DOMParser for browser XML parsing

[kuhe]

Issue

#3979

Description

Uses window.DOMParser in browsers instead of fast-xml-parser

Testing

new unit tests, also ran all of our existing S3 tests with the browser bundle, confirming that it is using the replacement.

Checklist

• [n/a] If the PR is a feature, add integration tests (*.integ.spec.ts).
  • XML parsing is only used on the response, at which point unit tests do the same job
• [n/a] 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?

[kuhe]

moved to aws origin

[github-actions]

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