fix: Use bytes instead of string comparison in delete validator queue (backport cosmos/cosmos-sdk#12303)

[0Tech]

Description

Cherry-pick of:

• fix: Use bytes instead of string comparison in delete validator queue cosmos/cosmos-sdk#12303

Motivation and context

How has this been tested?

Screenshots (if appropriate):

Checklist:

• I followed the contributing guidelines and code of conduct.
• I have added a relevant changelog to CHANGELOG.md
• I have added tests to cover my changes.
• I have updated the documentation accordingly.
• I have updated API documentation client/docs/swagger-ui/swagger.yaml

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1 out of 2 committers have signed the CLA.

✅ 0Tech
❌ williamchong
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[0Tech]

Please ignore CLA.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 70.43%. Comparing base (a7a39e5) to head (29cc88d).

❗ Current head 29cc88d differs from pull request most recent head b16ba19. Consider uploading reports for the commit b16ba19 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1301      +/-   ##
==========================================
- Coverage   70.43%   70.43%   -0.01%     
==========================================
  Files         643      643              
  Lines       54724    54726       +2     
==========================================
  Hits        38544    38544              
- Misses      14009    14010       +1     
- Partials     2171     2172       +1     

Files	Coverage Δ
x/staking/keeper/validator.go	80.95% <50.00%> (-1.27%)	⬇️

... and 3 files with indirect coverage changes

[0Tech]

Please ignore coverage on panic scenarios.