Fix: space-before-function-paren autofix removes comments (fixes #12259)

[mdjermanovic]

What is the purpose of this pull request? (put an "X" next to item)

[X] Bug fix #12259

This PR fixes the space-before-function-paren rule fixer with the "never" option, to:

• Concatenate block comments instead of removing them.
• Report error but doesn't fix anything if there is a line comment between.

Example:

Demo link

/* eslint space-before-function-paren:["error", "never"]*/

function foo /* */(){}

function bar /* 1 */
/* 2 */
/* 3 */ (){}

function baz // line comment
(){}

Current autofix behavior:

/* eslint space-before-function-paren:["error", "never"]*/

function foo(){}

function bar(){}

function baz(){}

New autofix behavior:

/* eslint space-before-function-paren:["error", "never"]*/

function foo/* */(){}

function bar/* 1 *//* 2 *//* 3 */(){}

function baz // line comment
(){}

baz is reported, but not auto-fixed.

What changes did you make? (Give an overview)

Modified the fixer to work similar to template-tag-spacing.

Is there anything you'd like reviewers to focus on?

[mysticatea]

LGTM as aligned the behavior to the existing rules.

I think that we should separate the space style around comments to another rule in the future.