refactor: Update landing_banners.priority_order list

[ChrisMattew]

Short description

This PR removes the SETTINGS_DISCOVERY value from the landing banners priority order configuration list

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.95%. Comparing base (7fa808b) to head (90d746c).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #470      +/-   ##
==========================================
- Coverage   63.97%   63.95%   -0.02%     
==========================================
  Files         164      164              
  Lines        5349     5349              
  Branches      708      708              
==========================================
- Hits         3422     3421       -1     
+ Misses       1926     1784     -142     
- Partials        1      144     +143     

Files with missing lines	Coverage Δ
src/payloads/backend.ts	100.00% <ø> (ø)

... and 34 files with indirect coverage changes

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[shadowsheep1]

LGTM

[Ladirico]

LGTM!