fix(eslint-plugin): [array-type] correct error message for readonly

[armano2]

PR Checklist

• Addresses an existing issue: fixes [array-type] ReadonlyArray is regarded as Array #4080
• That issue was marked as accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

[typescript-eslint]

Thanks for the PR, @armano2!

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[nx-cloud]

Nx Cloud Report

CI ran the following commands for commit b67e626. Click to see the status, the terminal output, and the build insights.

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Status	Command
	Node 12.x - nx test @typescript-eslint/eslint-plugin-tslint
	Node 12.x - nx test @typescript-eslint/eslint-plugin
	Node 12.x - nx test @typescript-eslint/eslint-plugin-internal
	Node 12.x - nx test @typescript-eslint/eslint-plugin-tslint
	Node 12.x - nx test @typescript-eslint/eslint-plugin
	Node 14.x - nx test @typescript-eslint/eslint-plugin-tslint
	Node 14.x - nx test @typescript-eslint/eslint-plugin
	Node 16.x - nx test @typescript-eslint/eslint-plugin-tslint
	Node 16.x - nx test @typescript-eslint/eslint-plugin
	Node 12.x - nx run-many --target=typecheck --all --parallel
	Node 12.x - nx test @typescript-eslint/parser

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[codecov]

Codecov Report

Merging #4193 (b67e626) into main (2e2ff5d) will increase coverage by 0.60%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #4193      +/-   ##
==========================================
+ Coverage   92.76%   93.37%   +0.60%     
==========================================
  Files         332      152     -180     
  Lines       11524     8057    -3467     
  Branches     3285     2590     -695     
==========================================
- Hits        10690     7523    -3167     
+ Misses        361      179     -182     
+ Partials      473      355     -118     

Flag	Coverage Δ
unittest	93.37% <100.00%> (+0.60%)	⬆️

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

Impacted Files	Coverage Δ
packages/eslint-plugin/src/rules/array-type.ts	98.59% <100.00%> (+0.08%)	⬆️
.../experimental-utils/src/eslint-utils/RuleTester.ts
packages/scope-manager/src/lib/es2019.ts
packages/scope-manager/src/lib/es2015.symbol.ts
...s/scope-manager/src/lib/webworker.importscripts.ts
packages/typescript-estree/src/ts-estree/index.ts
...ckages/scope-manager/src/lib/webworker.iterable.ts
packages/scope-manager/src/lib/esnext.full.ts
...ges/experimental-utils/src/ts-eslint/RuleTester.ts
...ript-estree/src/create-program/createSourceFile.ts
... and 171 more

[armano2]

no, this is not fully ok, i have to do one more fix

[armano2]

edit; now it should be ok

[armano2]

duplicate #4066