Changing HeaderWarning to always use 299 as the warning code (#80304) #80503
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This commit changes the deprecation logger so that all messages (critical or warning) are written
out with "299" as the level at the beginning of the header in order to be compliant with
https://www.rfc-editor.org/rfc/rfc7234.html#section-5.5.7. In #79107 we mistakenly began logging
warning-level messages with the 300 code, which is not valid in the RFC.