Detect localhost/127.0.0.1 code in multiple files

[ernilambar]

Fixes https://github.com/WordPress/plugin-check/issues/362

• Adds method files_preg_match in Abstract_File_Check to return multiple results matched with given regex.
• Update Localhost_Check to handle array of results
• Update Localhost_Check_Tests accordingly

[ernilambar]

cc: @swissspidy @felixarntz @mukeshpanchal27

[swissspidy]

Let's discuss the right approach on the issue first. This applies to other checks as well.

[frantorres]

Thanks for this change, I think that for this check it would be really useful to also give users the line + column where that happens (as well as showing more than one case for file). I mentioned this on #362 .

Also, I can suggest to add other common "localhost" cases like:

• https?:\/\/(?:[^\s\/]*\.)++local(?:host)? (this covers domains ending in .local and .localhost, for example: docker.local)

[ernilambar]

PR has been updated based on feedback.

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Co-authored-by: ernilambar <[email protected]>
Co-authored-by: swissspidy <[email protected]>
Co-authored-by: frantorres <[email protected]>

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