[fix] add move-heirarchy label to LMT

[AshleyDumaine]

What this PR does / why we need it: This makes it so LinodeMachineTemplates aren't left behind after a clusterctl move operation.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Special notes for your reviewer:

TODOs:

• squashed commits
• includes documentation
• adds unit tests
• adds or updates e2e tests

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.09%. Comparing base (062d08a) to head (a087677).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #435   +/-   ##
=======================================
  Coverage   65.09%   65.09%           
=======================================
  Files          68       68           
  Lines        3521     3521           
=======================================
  Hits         2292     2292           
  Misses       1051     1051           
  Partials      178      178           

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