chore: Remove unused imports in protobuf source files

[jannfis]

This removes some of the unused proto imports in our protobuf source files.

Signed-off-by: jannfis jann@mistrust.net

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[codecov]

Codecov Report

Merging #8528 (9b0ea23) into master (f059c99) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #8528   +/-   ##
=======================================
  Coverage   42.32%   42.32%           
=======================================
  Files         176      176           
  Lines       22823    22823           
=======================================
  Hits         9660     9660           
  Misses      11785    11785           
  Partials     1378     1378           

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