infra: enable no-useless-escape eslint rule

[ST-DDT]

This lint rule is likely to be enabled/"covered" by eslint rule unicorn/better-regex after #2418 is merged.

• infra(deps): add eslint unicorn #2418

This PR is independent of that PR though.

[codecov]

Codecov Report

Merging #2434 (0e44f6f) into next (c80c035) will increase coverage by 0.00%.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##             next    #2434   +/-   ##
=======================================
  Coverage   99.57%   99.58%           
=======================================
  Files        2823     2823           
  Lines      255523   255523           
  Branches     1098     1103    +5     
=======================================
+ Hits       254449   254468   +19     
+ Misses       1046     1027   -19     
  Partials       28       28           

Files	Coverage Δ
src/modules/git/index.ts	100.00% <100.00%> (ø)
src/modules/helpers/index.ts	99.12% <100.00%> (ø)
src/modules/internet/index.ts	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

[xDivisionByZerox]

This is acutally pretty cool. I always forget which characters to escape and default to simply ascaping all symbols. This lets me know while coding without having to look it up additionally. I like that.