fix: validation custom error with asterisk field

[ping-yee]

Description
Fixes #6245

• increase judgment if user set up custom validation error with asterisk field.
• increase testRunWithCustomErrorsAndAsteriskField for testing

Checklist:

• Securely signed commits
• Component(s) with PHPDoc blocks, only if necessary or adds value
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide

[kenjis]

Thank you for contribution!

I would like to ask for these three things:

• https://github.com/codeigniter4/CodeIgniter4/blob/develop/contributing/pull_request.md#signing
• https://github.com/codeigniter4/CodeIgniter4/blob/develop/contributing/pull_request.md#php-style
• https://github.com/codeigniter4/CodeIgniter4/blob/develop/contributing/pull_request.md#static-analysis-on-php-code

[MGatner]

Thanks for the submission @ping-yee! Please address Kenjis' concerns above.
Also let's get @iRedds in here to check the actual solution.

[ping-yee]

Thanks for your recommend and I will change my code to follow the contributing rules!
I will close this PR then open new one that has securely signed commits.

[iRedds]

@ping-yee Doesn't work if a label is specified.

[ping-yee]

@iRedds Like what data set?
Because I run the all of validation test and don't get the problem...

[iRedds]

['foo.*.bar' => ['label' => 'foo bar', 'rules' => 'required']],

[ping-yee]

@iRedds Ok, I got it.
I'll fix this problem when I sent the new PR with securely signed commits.