[fix]: short circuit worker logging & require explicit opt-in

[jamieQ]

Issue

the existing os logging implementations log various type descriptions as part of the log message. these strings are apparently calculated even if the logging has been disabled, which introduces unneeded/undesirable work in release builds. these logs shouldn't be made in release builds, and should be opt-in in other contexts.

Description

this change adds short circuiting logic for all the os logging methods in addition to a new environment variable check that can be used to enable the logging when debugging.

• TODO: WorkflowLogger should probably get the same treatment

Checklist

• Unit Tests – didn't add unit tests, but manually ran existing ones using the new env variable to confirm expected behavior (os_log calls aren't made when the env var isn't set)
  - [x] UI Tests n/a
  - [x] Snapshot Tests (iOS only) n/a
  - [x] I have made corresponding changes to the documentation n/a

[natecraft1]

Thanks for jumping on this! I made this ticket https://block.atlassian.net/browse/MPR-2752 so MPR can start to track the hangs that are being addressed