Remove strip-ansi dependency

[roli-lpci]

Summary

• Replace strip-ansi with an inline regex equivalent
• Removes 1 runtime dependency (strip-ansi + its transitive dep ansi-regex)

Changes

client.js

• Replace require('strip-ansi') with an inline strip() function using the
  same ANSI escape regex from ansi-regex v5 (the version used by strip-ansi v6)
• Since client.js runs in the browser (bundled by webpack), the native Node.js
  util.stripVTControlCharacters API cannot be used here

package.json

• Remove strip-ansi from dependencies

Testing

• ESLint: passes (with scoped no-control-regex disable for the ANSI regex literal)
• Prettier: passes
• Mocha tests: 1 pre-existing flaky failure in realistic multi compiler (reproduces on main)

Addresses #465

[evenstensberg]

I prefer to keep strip ansi. Anything related to regex's is a security sink

[glenjamin]

I agree, this is a simple dependency that does one thing well, there is little to be gained by inlining it

[alexander-akait]

@evenstensberg There is a good example how our issue PR is ignored, we should look how to disable it (due AI generated)