make DataTables:getCellContent() a public function again

[simontaurus]

Refs: #918

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 45.52%. Comparing base (a95d3b8) to head (5d82004).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #919   +/-   ##
=========================================
  Coverage     45.52%   45.52%           
  Complexity     2319     2319           
=========================================
  Files            80       80           
  Lines          9050     9050           
=========================================
  Hits           4120     4120           
  Misses         4930     4930           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.