Refactor code to comply with ESLint rules

Major refactoring using ESLint with rules from AirBnb and Vue.

Enable most of the ESLint rules and do necessary linting in the code.
Also add more information for rules that are disabled to describe what
they are and why they are disabled.

Allow logging (`console.log`) in test files, and in development mode
(e.g. when working with `npm run serve`), but disable it when
environment is production (as pre-configured by Vue). Also add flag
(`--mode production`) in `lint:eslint` command so production linting is
executed earlier in lifecycle.

Disable rules that requires a separate work. Such as ESLint rules that
are broken in TypeScript: no-useless-constructor (eslint/eslint#14118)
and no-shadow (eslint/eslint#13014).

tests/unit/stubs/ScriptStub.ts

@@ -4,43 +4,46 @@ import { RecommendationLevel } from '@/domain/RecommendationLevel';
 import { SelectedScript } from '@/application/Context/State/Selection/SelectedScript';
 
 export class ScriptStub extends BaseEntity<string> implements IScript {
-    public name = `name${this.id}`;
-    public code = {
-        execute: `REM execute-code (${this.id})`,
-        revert: `REM revert-code (${this.id})`,
-    };
-    public readonly documentationUrls = new Array<string>();
-    public level = RecommendationLevel.Standard;
+  public name = `name${this.id}`;
 
-    constructor(public readonly id: string) {
-        super(id);
-    }
+  public code = {
+    execute: `REM execute-code (${this.id})`,
+    revert: `REM revert-code (${this.id})`,
+  };
 
-    public canRevert(): boolean {
-        return Boolean(this.code.revert);
-    }
+  public readonly documentationUrls = new Array<string>();
 
-    public withLevel(value: RecommendationLevel): ScriptStub {
-        this.level = value;
-        return this;
-    }
+  public level = RecommendationLevel.Standard;
 
-    public withCode(value: string): ScriptStub {
-        this.code.execute = value;
-        return this;
-    }
+  constructor(public readonly id: string) {
+    super(id);
+  }
 
-    public withName(name: string): ScriptStub {
-        this.name = name;
-        return this;
-    }
+  public canRevert(): boolean {
+    return Boolean(this.code.revert);
+  }
 
-    public withRevertCode(revertCode: string): ScriptStub {
-        this.code.revert = revertCode;
-        return this;
-    }
+  public withLevel(value: RecommendationLevel): ScriptStub {
+    this.level = value;
+    return this;
+  }
 
-    public toSelectedScript(isReverted = false): SelectedScript {
-        return new SelectedScript(this, isReverted);
-    }
+  public withCode(value: string): ScriptStub {
+    this.code.execute = value;
+    return this;
+  }
+
+  public withName(name: string): ScriptStub {
+    this.name = name;
+    return this;
+  }
+
+  public withRevertCode(revertCode: string): ScriptStub {
+    this.code.revert = revertCode;
+    return this;
+  }
+
+  public toSelectedScript(isReverted = false): SelectedScript {
+    return new SelectedScript(this, isReverted);
+  }
 }