[Fix] Updates table nullMessage descriptions

[mnigh]

🤖 Resolves #9463.

👋 Introduction

This PR removes the fallback for the nullMessage.description prop for the Table component and adds custom messages for where there is an add prop.

🧪 Testing

Assist reviewers with steps they can take to test that the PR does what it says it does.

1. Navigate to tables
2. Verify any table that has an add or create button has an instructional description when the table yields no results.

📸 Screenshots

add prop exists

add prop does not exist

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 38.27%. Comparing base (3949429) to head (c28f6b7).
Report is 2 commits behind head on main.

Files	Patch %	Lines
...c/components/Table/ResponsiveTable/NullMessage.tsx	33.33%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #10789      +/-   ##
============================================
- Coverage     38.27%   38.27%   -0.01%     
  Complexity     1652     1652              
============================================
  Files          1021     1021              
  Lines         31192    31191       -1     
  Branches       6511     6509       -2     
============================================
- Hits          11939    11937       -2     
- Misses        19087    19229     +142     
+ Partials        166       25     -141     

Flag	Coverage Δ
integrationtests	67.79% <ø> (-0.10%)	⬇️
unittests	31.16% <33.33%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

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

[petertgiles]

Nice, very clean. 🧹