Add missing migration for scheduled TimecardNotes

[timoballard]

Description

We missed a migration in the original PR. Adding here.

#967

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@f968a4e). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #1067   +/-   ##
=========================================
  Coverage          ?   88.47%           
=========================================
  Files             ?       41           
  Lines             ?     1796           
  Branches          ?        0           
=========================================
  Hits              ?     1589           
  Misses            ?      207           
  Partials          ?        0           

Impacted Files	Coverage Δ
employees/forms.py	100.00% <0.00%> (ø)
hours/urls/timesheets.py	100.00% <0.00%> (ø)
api/urls.py	100.00% <0.00%> (ø)
tock/wsgi.py	0.00% <0.00%> (ø)
hours/apps.py	100.00% <0.00%> (ø)
employees/signals.py	100.00% <0.00%> (ø)
...agement/commands/load_timecard_utilization_data.py	0.00% <0.00%> (ø)
...agement/commands/calculate_timecard_utilization.py	0.00% <0.00%> (ø)
tock/utils.py	85.36% <0.00%> (ø)
hours/admin.py	71.21% <0.00%> (ø)
... and 31 more

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