fix(runner.server): Pass lowercase log level to uvicorn server (#15680) #17476

Job	Run time
docker, python:3.9	5m 3s
docker, python:3.10	5m 11s
docker, python:3.11	5m 26s
Server Tests - python:3.9, postgres:14	4m 44s
docker, python:3.12	6m 31s
Server Tests - python:3.10, postgres:14	4m 25s
Server Tests - python:3.11, postgres:14	4m 35s
Server Tests - python:3.12, postgres:14	6m 4s
Server Tests - python:3.9, sqlite	6m 25s
Server Tests - python:3.10, sqlite	6m 50s
Server Tests - python:3.11, sqlite	6m 55s
Server Tests - python:3.12, sqlite	8m 37s
Client Tests - python:3.9, postgres:14	6m 45s
Client Tests - python:3.10, postgres:14	6m 32s
Client Tests - python:3.11, postgres:14	7m 31s
Client Tests - python:3.12, postgres:14	8m 11s
Runner and Worker Tests - python:3.9, postgres:14	2m 8s
Runner and Worker Tests - python:3.10, postgres:14	1m 47s
Runner and Worker Tests - python:3.11, postgres:14	1m 45s
Runner and Worker Tests - python:3.12, postgres:14	2m 29s
combine-coverage	43s
	1h 48m 37s

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