Remove requirement that full snapshot intervals are a multiple of incremental

[jstarry]

Problem

There's no need to restrict snapshot intervals such that full is a multiple of incremental

Summary of Changes

• Loosen snapshot validation check
• Update validator warning to reflect loosened constraint

Fixes #

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.3%. Comparing base (46b71e0) to head (40197da).
⚠️ Report is 3798 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #5519     +/-   ##
=========================================
- Coverage    83.3%    83.3%   -0.1%     
=========================================
  Files         825      825             
  Lines      372556   372493     -63     
=========================================
- Hits       310479   310394     -85     
- Misses      62077    62099     +22     

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