Consolidate the HTTP Status Code field

Matias Alvarezrequested to merge
malvarez-consolidate-http-status-code-field into main

What does this MR do?

This MR consolidates the HTTP Status Code field introduced in labkit!273 (merged).

The changes are related to the bigger initiative of consolidating logging fields.

Why was this MR needed?

What's the best way to test this MR?

What are the relevant issue numbers?

Related issue: gitlab-org/quality/quality-engineering/team-tasks#4088 (closed)

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