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Allow underscores in deprecated_config soft errors

Summary: Our soft error categories have very limited characters due to logview restrictions, so in order to create free form soft error categories, we trim all non-lowercase ASCII characters. However, this also trims underscores and create hard to read soft error categories look like `deprecated_config_deprecatedconfig_ovrconfiglogginginternal:quiet=true`. Change this to preserve underscores.

Reviewed By: mzlee

Differential Revision: D73057249

fbshipit-source-id: b8d7f704d17cf924ebc3fcf45e507bbda3765073