Remove eslint prettier utilities

[trivikr]

Issue #, if available:

• Refs: https://www.joshuakgoldberg.com/blog/you-probably-dont-need-eslint-config-prettier-or-eslint-plugin-prettier/
• Cleanup needed before upgrading eslint which is required for TypeScript upgrade in Bump TypeScript to ~5.4.x in smithy JS packages #1263

Description of changes:

Removes eslint prettier utilities

Verified that eslint and prettier runs on source code without any conflicts

$ yarn lint
...
 Tasks:    59 successful, 59 total
Cached:    0 cached, 59 total
  Time:    10.737s

$ yarn prettier --write 'packages/**/*.{ts,md,json}'

$ yarn prettier --write 'smithy-typescript-ssdk-libs/**/*.{ts,md,json}'

---

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.