chore: cleanup deprecated code

[robert-zaremba]

No description provided.

[codecov]

Codecov Report

Merging #2060 (4d452dc) into main (7f05ad4) will decrease coverage by 4.81%.
The diff coverage is 59.07%.

@@            Coverage Diff             @@
##             main    #2060      +/-   ##
==========================================
- Coverage   75.38%   70.58%   -4.81%     
==========================================
  Files         100      126      +26     
  Lines        8025     9580    +1555     
==========================================
+ Hits         6050     6762     +712     
- Misses       1589     2352     +763     
- Partials      386      466      +80     

Impacted Files	Coverage Δ
util/store/unmarshal.go	0.00% <0.00%> (ø)
x/incentive/codec.go	47.82% <ø> (+9.89%)	⬆️
x/incentive/keeper/hooks.go	0.00% <0.00%> (ø)
x/incentive/keeper/invariants.go	0.00% <0.00%> (ø)
x/leverage/keeper/incentive.go	0.00% <0.00%> (ø)
x/leverage/types/keys.go	100.00% <ø> (ø)
x/leverage/types/proposal.go	33.33% <0.00%> (ø)
x/oracle/keeper/hooks.go	95.65% <ø> (ø)
x/oracle/types/keys.go	90.47% <ø> (ø)
x/oracle/types/msgs.go	81.05% <0.00%> (ø)
... and 54 more

... and 2 files with indirect coverage changes

[gsk967]

LGTM