fix(core): should_warn checks if kong global has been defined #13310
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Summary
After merging: #13069 it was revealed in some tests that
kong
global might not have been initialized yet. This PR checks first if kong global is defined as it's done in a few other places in this module. It's just to make sure unit test work.Checklist
changelog/unreleased/kong
orskip-changelog
label added on PR if changelog is unnecessary. README.mdIssue reference
KAG-4515