…combine` (#4077)

* merge the Swagger files manually instead use nodejs swagger-combine

* add changelog

* remove unused function vars

* remove unused error handler

---------

Co-authored-by: Pantani <Pantani>
(cherry picked from commit 6de2f33)

# Conflicts:
#	go.mod
#	go.sum
#	ignite/pkg/cosmosgen/generate_openapi.go
#	ignite/pkg/nodetime/programs/swagger-combine/swagger-combine.go

# Conflicts:
#	go.mod
#	go.sum
#	integration/doctor/testdata/missing-tools.go.txt

…/release/v28.x.y/pr-4077

# Conflicts:
#	ignite/pkg/cosmosgen/generate_openapi.go
#	ignite/templates/app/files/go.mod.plush