ESLint: disallow importing Enzyme for React testing

[ciampo]

Why

We should recommend using RTL instead of Enzyme for all new tests

What

We should add a ESLint rule to help enforce that

A/C

• Add new ESLint rule
• Disable rule in all existing files importing Enzyme

Originally posted by @gziolo in #34423 (comment)

[tyxla]

We can actually close this, enzyme has been gone for almost 3 months since we removed it in #44494.