fix(insights): updated empty-state copy for caches / queues

[bcoe]

Better describe the benefits of using the cache / queue insights modules:

[codecov]

Bundle Report

Changes will decrease total bundle size by 20.06kB ⬇️

Bundle name	Size	Change
app-webpack-bundle-array-push	27.29MB	20.06kB ⬇️

[DominikB2014]

Nice! This is a lot more descriptive

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.05%. Comparing base (9ebd80d) to head (bb0437e).

❗ Current head bb0437e differs from pull request most recent head 66c0382

Please upload reports for the commit 66c0382 to get more accurate results.

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #72905       +/-   ##
===========================================
+ Coverage   53.77%   78.05%   +24.28%     
===========================================
  Files        2891     6606     +3715     
  Lines      179964   294460   +114496     
  Branches    32175    50763    +18588     
===========================================
+ Hits        96767   229832   +133065     
+ Misses      78827    58296    -20531     
- Partials     4370     6332     +1962     

Files	Coverage Δ
static/app/views/performance/cache/settings.ts	100.00% <ø> (ø)
static/app/views/performance/queues/settings.ts	100.00% <ø> (ø)

... and 5695 files with indirect coverage changes