fix(eslint-plugin): [no-unsafe-argument] handle tuple types on rest arguments

[bradzacher]

@G-Rath noticed that we were false-reporting on jest expect functions.
Turns out this was because I hadn't handled tuple rest types.

It turns out that generic array rest types are reported by TS as if they were tuples.
So for function foo<T extends any[]>(...param: T): void - param will always report as a tuple.
Eg foo(1, 2, 'a', 1 as any) will report the type of param to be [number, number, string, any]. Which means we can't actually do a check here 😢

[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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[codecov]

Codecov Report

Merging #3269 (b8494a7) into master (9238e91) will increase coverage by 0.01%.
The diff coverage is 81.25%.

@@            Coverage Diff             @@
##           master    #3269      +/-   ##
==========================================
+ Coverage   92.80%   92.82%   +0.01%     
==========================================
  Files         318      318              
  Lines       10984    11003      +19     
  Branches     3105     3110       +5     
==========================================
+ Hits        10194    10213      +19     
  Misses        350      350              
  Partials      440      440              

Flag	Coverage Δ
unittest	92.82% <81.25%> (+0.01%)	⬆️

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

Impacted Files	Coverage Δ
...ages/eslint-plugin/src/rules/no-unsafe-argument.ts	85.22% <81.25%> (+4.06%)	⬆️