build tools: remove the eslint --fix Git precommit hook

[ntwb]

Description

Reverts #4985

The package lint-staged currently has no support to lint only the Git staged lines or files, as such this can cause unexpected changes to be added during commit as after ESLint has run git add is run. This makes using a Git workflow such as git add -p unworkable.

Reverting this for now to seek an alternative solution that supports linting and adding only staged changes.

How Has This Been Tested?

n/a

Screenshots (jpeg or gifs if applicable):

Types of changes

Build tooling change

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code has proper inline documentation.

[atimmer]

Should we still let ESLint run without the --fix flag? That would display any warnings and stop the commit when it errors.

[ntwb]

The way lint-staged works it would continue to run git add after ESLint has run if there were no errors or warnings, and as lint-staged requires the git add component in its current implementation let's remove it altogether for now.

[aduth]

Needs conflict resolution, but 👍 otherwise.