Set SPARSE_OK=TRUE for COGs

[jterry64]

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

Header is too big for integrated alerts COG

Issue Number: N/A

What is the new behavior?

Set SPARSE_OK=TRUE to reduce header size.

Does this introduce a breaking change?

• Yes
• No

Other information

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.93%. Comparing base (c79cfff) to head (d955884).

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #577   +/-   ##
=======================================
  Coverage   81.93%   81.93%           
=======================================
  Files         126      126           
  Lines        5697     5697           
=======================================
  Hits         4668     4668           
  Misses       1029     1029           

Flag	Coverage Δ
unittests	81.93% <ø> (ø)

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[danscales]

Hopefully this reduces the metadata enough!