WordPress-VIP-Go: Add ignore statement for ruleset since VariableAnalysis.CodeAnalysis.VariableAnalysis

[rebeccahum]

Removing the global $wpdb in #635 triggered a warning on line 300.

[rebeccahum]

Nevermind, going to stick this in #635 since related.

[jrfnl]

My comment is superseded by the issue being closed while I was writing it.

Posting it anyway in case this comes up again.

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With the current develop branch I cannot reproduce the issue this is supposedly solving.
Running phpcs ./wordpress-vip-go/ruleset-test.inc --standard=wordpress-vip-go does not show any errors or warnings on line 300.

I might be misunderstanding, so could you please elaborate on what this is supposed to be solving ?

Other notes:

• Is an ignore comment the right way to solve it ? Or should the variable be added to the list of variables at the top of the file ?
• If an ignore comment is the way to go: can the ignore comment be made error code specific ?

[rebeccahum]

@jrfnl The test was failing on #635 and I mistakenly thought it was unrelated but after further inspection, it was related so I'm putting it in that PR.

Edit: After thinking more on this, adding the ignore comment is a dependency that we don't need so I have added the global to that line.