[cmd/mdatagen] Remove dead field telemetry::level

[mx-psi]

Description

Removes telemetry::level, which is unused. If this was intended to serve as the 'minimum level' for a component, I can handle that on #12143.

This is a breaking change, but since the field was effectively dead I think that's fine.

Link to tracking issue

Updates #11061

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.72%. Comparing base (dcc866c) to head (e0f4eb8).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #12144   +/-   ##
=======================================
  Coverage   91.72%   91.72%           
=======================================
  Files         463      463           
  Lines       24821    24821           
=======================================
  Hits        22767    22767           
  Misses       1672     1672           
  Partials      382      382           

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