[py][BiDi] use constant for LogLevel #14344

Job	Run time
Check	5m 36s
Python / Build / Build	2m 35s
.NET	0s
Rust	0s
Java	0s
Ruby	0s
Python / Lint	21s
Python / Mypy	20s
Python / Documentation	1m 0s
Python / Browser Tests (edge, ubuntu) / Integration Tests (edge, ubuntu)	19m 12s
Python / Remote Tests (firefox) / Integration Tests (remote, firefox)	14m 22s
Python / Browser Tests (chrome, ubuntu) / Integration Tests (chrome, ubuntu)	17m 0s
Python / Browser Tests (firefox, ubuntu) / Integration Tests (firefox, ubuntu)	45m 40s
Python / Browser Tests (safari, macos) / Integration Tests (safari, macos)	2m 10s
	1h 48m 16s

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