Reduce limit for list datasets jobs in UI

[wslulciuc]

Problem

The current UI default limit to list datasets and jobs is 2000 which can be an expensive query. A more ideal approach would be to introduce paging (see #1711), but for now, let's use a reasonable default 25.

Solution

Reduce limit for list datasets jobs from 2000 to 25.

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)

[codecov]

Codecov Report

Merging #2018 (33e0d9b) into main (c53f66c) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main    #2018   +/-   ##
=========================================
  Coverage     78.89%   78.89%           
  Complexity     1014     1014           
=========================================
  Files           197      197           
  Lines          5548     5548           
  Branches        421      421           
=========================================
  Hits           4377     4377           
  Misses          724      724           
  Partials        447      447           

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[phixMe]

Thanks @wslulciuc