prepare changelog for 0.28.0

[merobi-hub]

Signed-off-by: Michael Robinson merobi@gmail.com

Problem

The changelog requires updating for the 0.28.0 release.

Solution

This PR updates the changelog.

Note: All database schema changes require discussion. Please link the issue for context.

Checklist

• You've signed-off your work
• Your changes are accompanied by tests (if relevant)
• Your change contains a small diff and is self-contained
• You've updated any relevant documentation (if relevant)
• You've updated the CHANGELOG.md with details about your change under the "Unreleased" section (if relevant, depending on the change, this may not be necessary)
• You've versioned your .sql database schema migration according to Flyway's naming convention (if relevant)
• You've included a header in any source code files (if relevant)

[codecov]

Codecov Report

Merging #2246 (cbabf23) into main (0f857c5) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main    #2246   +/-   ##
=========================================
  Coverage     76.47%   76.47%           
  Complexity     1113     1113           
=========================================
  Files           216      216           
  Lines          5203     5203           
  Branches        421      421           
=========================================
  Hits           3979     3979           
  Misses          752      752           
  Partials        472      472           

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[wslulciuc]

@merobi-hub, as discussed offline, we'll hold off on the release of 0.28.0 until #2244 is merged.