refactor: convert keeper tests to testsuite

[NagaTulasi]

Description

Closes: #10046

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Author Checklist

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please add links to any relevant follow up issues.

I have...

• included the correct type prefix in the PR title
• added ! to the type prefix if API or client breaking change
• targeted the correct branch (see PR Targeting)
• provided a link to the relevant issue or specification
• followed the guidelines for building modules
• included the necessary unit and integration tests
• added a changelog entry to CHANGELOG.md
• included comments for documenting Go code
• updated the relevant documentation or specification
• reviewed "Files changed" and left comments if necessary
• confirmed all CI checks have passed

Reviewers Checklist

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your handle next to the items reviewed if you only reviewed selected items.

I have...

• confirmed the correct type prefix in the PR title
• confirmed ! in the type prefix if API or client breaking change
• confirmed all author checklist items have been addressed
• reviewed state machine logic
• reviewed API design and naming
• reviewed documentation is accurate
• reviewed tests and test coverage
• manually tested (if applicable)

[codecov]

Codecov Report

Merging #10187 (f98f71e) into master (9ebd12b) will decrease coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #10187      +/-   ##
==========================================
- Coverage   63.72%   63.67%   -0.06%     
==========================================
  Files         573      573              
  Lines       53764    53764              
==========================================
- Hits        34263    34235      -28     
- Misses      17553    17582      +29     
+ Partials     1948     1947       -1     

Impacted Files	Coverage Δ
x/mint/keeper/querier.go	2.85% <0.00%> (-71.43%)	⬇️
x/params/keeper/grpc_query.go	73.68% <0.00%> (-10.53%)	⬇️
crypto/keys/internal/ecdsa/privkey.go	84.21% <0.00%> (+1.75%)	⬆️

[anilcse]

Lgtm

all comments have been addressed