style: various linting fixes (#15675)

## Description

fix various linting issues

---

### Author Checklist

*All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.*

I have...

* [ ] included the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
* [ ] added `!` to the type prefix if API or client breaking change
* [ ] targeted the correct branch (see [PR Targeting](https://github.com/cosmos/cosmos-sdk/blob/main/CONTRIBUTING.md#pr-targeting))
* [ ] provided a link to the relevant issue or specification
* [ ] followed the guidelines for [building modules](https://github.com/cosmos/cosmos-sdk/blob/main/docs/docs/building-modules)
* [ ] included the necessary unit and integration [tests](https://github.com/cosmos/cosmos-sdk/blob/main/CONTRIBUTING.md#testing)
* [ ] added a changelog entry to `CHANGELOG.md`
* [ ] included comments for [documenting Go code](https://blog.golang.org/godoc)
* [ ] updated the relevant documentation or specification
* [ ] reviewed "Files changed" and left comments if necessary
* [ ] confirmed all CI checks have passed

### Reviewers Checklist

*All items are required. Please add a note if the item is not applicable and please add
your handle next to the items reviewed if you only reviewed selected items.*

I have...

* [ ] confirmed the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) 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)

testutil/rest.go

@@ -42,7 +42,7 @@ func GetRequestWithHeaders(url string, headers map[string]string) ([]byte, error
 // GetRequest defines a wrapper around an HTTP GET request with a provided URL.
 // An error is returned if the request or reading the body fails.
 func GetRequest(url string) ([]byte, error) {
-	res, err := http.Get(url) //nolint:gosec
+	res, err := http.Get(url) //nolint:gosec // only used for testing
 	if err != nil {
 		return nil, err
 	}
@@ -61,7 +61,7 @@ func GetRequest(url string) ([]byte, error) {
 // PostRequest defines a wrapper around an HTTP POST request with a provided URL and data.
 // An error is returned if the request or reading the body fails.
 func PostRequest(url, contentType string, data []byte) ([]byte, error) {
-	res, err := http.Post(url, contentType, bytes.NewBuffer(data)) //nolint:gosec
+	res, err := http.Post(url, contentType, bytes.NewBuffer(data)) //nolint:gosec // only used	for testing
 	if err != nil {
 		return nil, fmt.Errorf("error while sending post request: %w", err)
 	}

testutil/sims/simulation_helpers.go

@@ -68,7 +68,7 @@ func SimulationOperations(app runtime.AppI, cdc codec.JSONCodec, config simtypes
 		}
 	}
 
-	simState.LegacyProposalContents = app.SimulationManager().GetProposalContents(simState) //nolint:staticcheck
+	simState.LegacyProposalContents = app.SimulationManager().GetProposalContents(simState) //nolint:staticcheck // used for legacy testing
 	simState.ProposalMsgs = app.SimulationManager().GetProposalMsgs(simState)
 	return app.SimulationManager().WeightedOperations(simState)
 }