feat(utils): revert removal of backwards-compat functions

[bradzacher]

Overview

Removed these in #8377 - but on second thought removing them is not good right now.

Our goal for this next major is that users just bump our peer dependencies (typescript and eslint). If we remove these functions then 3rd party plugins might break - meaning a user has to upgrade our peer deps AND 3rd party plugins. This isn't what we want - we want a isolated and painless major!

Adding them back and marking as @deprecated so that things keep working for now. We'll remove them in our next major.

[typescript-eslint]

Thanks for the PR, @bradzacher!

typescript-eslint is a 100% community driven project, and we are incredibly grateful that you are contributing to that community.

The core maintainers work on this in their personal time, so please understand that it may not be possible for them to review your work immediately.

Thanks again!

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✅ Successfully ran 33 targets

• nx test utils
• nx run types:build
• nx test eslint-plugin
• nx test typescript-eslint
• nx test typescript-estree
• nx run repo-tools:postinstall-script
• nx test scope-manager
• nx test repo-tools
• nx test rule-schema-to-typescript-types
• nx test parser
• nx test visitor-keys
• nx test type-utils
• nx test eslint-plugin-internal
• nx run-many --target=lint --parallel
• nx run-many --target=build --parallel --exclude=website --exclude=website-eslint
• nx test eslint-plugin-tslint
• nx test ast-spec
• nx test utils --coverage=false
• nx test visitor-keys --coverage=false
• nx run-many --target=typecheck --parallel
• nx run integration-tests:test
• nx test repo-tools --coverage=false
• nx test eslint-plugin-internal --coverage=false
• nx test typescript-eslint --coverage=false
• nx test parser --coverage=false
• nx test typescript-estree --coverage=false
• nx test eslint-plugin-tslint --coverage=false
• nx test eslint-plugin --coverage=false
• nx run repo-tools:generate-configs
• nx test type-utils --coverage=false
• nx test rule-schema-to-typescript-types --coverage=false
• nx test scope-manager --coverage=false
• nx test ast-spec --coverage=false

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[codecov]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (8ef5f4b) 87.78% compared to head (4dd19da) 86.94%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8399      +/-   ##
==========================================
- Coverage   87.78%   86.94%   -0.84%     
==========================================
  Files         397      252     -145     
  Lines       13821    12251    -1570     
  Branches     4067     3861     -206     
==========================================
- Hits        12133    10652    -1481     
+ Misses       1391     1332      -59     
+ Partials      297      267      -30     

Flag	Coverage Δ
unittest	86.94% <0.00%> (-0.84%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
packages/utils/src/eslint-utils/context.ts	0.00% <0.00%> (ø)

... and 146 files with indirect coverage changes