Remove switching logic within settings config

[cicdw]

This is making test-writing harder and prevents us from making server changes independently of client changes easily. (ref: #16951 )

[cicdw]

i think the labeler workflow failure is happening off main, so my PR should resolve it

[codspeed-hq]

CodSpeed Performance Report

Merging #16961 will not alter performance

_{Comparing remove-test-mode-config-logic (3fe5a6b) with main (31fb757)}

Summary

✅ 2 untouched benchmarks