Remove quicksilver upgrades and add saffron

[SpicyLemon]

Description

Remove the quicksilver upgrades and add ones for saffron with just the standard upgrade stuffs.

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Before we can merge this PR, please make sure that all the following items have been
checked off. If any of the checklist items are not applicable, please leave them but
write a little note why.

• Targeted PR against correct branch (see CONTRIBUTING.md)
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Wrote unit and integration tests
• Updated relevant documentation (docs/) or specification (x/<module>/spec/)
• Added relevant godoc comments.
• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md
• Re-reviewed Files changed in the Github PR explorer
• Review Codecov Report in the comment section below once CI passes

[codecov]

Codecov Report

Merging #1648 (98bfdf9) into main (60edc7d) will increase coverage by 0.01%.
The diff coverage is 66.66%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1648      +/-   ##
==========================================
+ Coverage   63.81%   63.83%   +0.01%     
==========================================
  Files         223      223              
  Lines       28599    28587      -12     
==========================================
- Hits        18251    18249       -2     
+ Misses       9156     9145      -11     
- Partials     1192     1193       +1     

Files Changed	Coverage Δ
x/attribute/keeper/keeper.go	77.65% <ø> (+0.21%)	⬆️
x/marker/keeper/marker.go	55.53% <ø> (-0.51%)	⬇️
app/upgrades.go	63.58% <66.66%> (+4.69%)	⬆️