tools: remove mockery from tools.go (#9196)

The `mockery` project recommends against using a binary of `mockery` that has been created using `go install`. https://github.com/vektra/mockery/pull/456. Developers of Tendermint wishing to generate mocks should avoid having a version of `mockery` on their path that does not match the version listed in  [mockery_generate.sh](10e1ac8fea/scripts/mockery_generate.sh (L11)). To make this easier for developers, the `mockery_generate.sh` script uses a containerized copy of `mockery` if `mockery` is not present on the developer's `PATH`. This containerized version of `mockery` uses the same version of mockery as our CI pipelines and allows all developers to automatically use the same version without having to manage it themselves. 

#### PR checklist

- [ ] Tests written/updated, or no tests needed
- [ ] `CHANGELOG_PENDING.md` updated, or no changelog entry needed
- [ ] Updated relevant documentation (`docs/`) and code comments, or no
      documentation updates needed

light/rpc/mocks/light_client.go

@@ -100,13 +100,13 @@ func (_m *LightClient) VerifyLightBlockAtHeight(ctx context.Context, height int6
 	return r0, r1
 }
 
-type NewLightClientT interface {
+type mockConstructorTestingTNewLightClient interface {
 	mock.TestingT
 	Cleanup(func())
 }
 
 // NewLightClient creates a new instance of LightClient. It also registers a testing interface on the mock and a cleanup function to assert the mocks expectations.
-func NewLightClient(t NewLightClientT) *LightClient {
+func NewLightClient(t mockConstructorTestingTNewLightClient) *LightClient {
 	mock := &LightClient{}
 	mock.Mock.Test(t)