Docs for SERVER-35847: Remove db.eval(), update tests and helpers

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Original Description

Description:

This remove the

command which makes related helpers (db.eval(), db.dbEval(), db.copyTo(), now fail when run against a 4.2+ server. The helper function remain in the shell for connecting to older versions of MongoDB.

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Description

Scope of changes (files that need work and how much)

• 4.2.txt
• 4.2-compatibility
• delete eval command page (add redirect to 4.2-eval-command)
• shell helpers db.eval and db.collection.copyTo – blurb that they cannot use with versions 4.2 or greater and point to earlier versions of manual
• Remove mention of db.eval or eval command from
  • source/reference/mongodb-extended-json.txt
  • source/reference/database-profiler.txt
  • source/includes/warning-copyto-loss-of-type-fidelity.rst
  • source/includes/limits-sharding-unavailable-operations.rst
  • source/includes/extracts-admonition-js-prevalence.yaml

Impact to other docs outside of this product

MVP (work and date?)

Resources (e.g. Scope Docs, Invision)