Clears PHPCompatibility phpcs warnings

[pschoffer]

Description

• Switches func_get_args to spread operator
• Ignores debug_backtrace warning
  Details bellow vvv

Changelog Description

Resolves PHPCompatibility phpcs warnings for PHP 7.4

The warnings were already reviewed previously and deemed false positive in this case.

However, we updated the implementation here to silence/resolve the warnings.

Checklist

Please make sure the items below have been covered before requesting a review:

• This change works and has been tested locally (or has an appropriate fallback).
• This change works and has been tested on a Go sandbox.
• This change has relevant unit tests (if applicable).
• This change has relevant documentation additions / updates (if applicable).
• (For Automatticians) I've created a changelog draft.

Steps to Test

Add folowing code after logger was loaded (e.g. debug.php):

foreach( [1,2] as $ix) {
	lo("foo", "bar");
}

Running any request/CLI (e.g. wp post list) should then print foo and bar (only once as we are using lo - log once in the example).

Note:
In vip-dev environment, you might need to set a constant (as logs are not printed in prod environments):

define('WPCOM_SANDBOXED', true);

[netsuso]

Looks good to me (and works for me)!

[brandon-m-skinner]

The Changelog Description template isn't filled in and is just sitting at the bottom of the description. Please use the template 🙇.

[pschoffer]

Stacks-1314.