Add result column to migration table

[fil512]

A new RESULT column has been added to the database migration table to record the migration execution result.
values are:

• NOT_APPLIED_SKIPPED (either skipped via the skip-versions flag or if the migration task was stubbed),
• NOT_APPLIED_NOT_FOR_THIS_DATABASE (does not apply to that database),
• NOT_APPLIED_PRECONDITION_NOT_MET (not run based on a SQL script outcome),
• NOT_APPLIED_ALLOWED_FAILURE (the migration failed, but it is permitted to fail)
• APPLIED.

[github-actions]

Formatting check succeeded!

[jmarchionatto]

Looks good! Approved

[tadgh]

approved pending comments. I imagine all existing columns will just be null, which is fine.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.49%. Comparing base (406db33) to head (b2628c3).
Report is 147 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6580      +/-   ##
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- Coverage     83.54%   83.49%   -0.05%     
- Complexity    27432    28526    +1094     
============================================
  Files          1707     1795      +88     
  Lines        106185   111059    +4874     
  Branches      13397    13953     +556     
============================================
+ Hits          88710    92729    +4019     
- Misses        11750    12353     +603     
- Partials       5725     5977     +252     

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