OZG-7324: Fix license header

.gitignore

Dockerfile

api/gateway-config.yml

api/openapi-config.yml

buf.gen.yaml

buf.yaml

cmd/info-manager-proxy/main.go

config/config-local.yml

config/config.yml

internal/config/config.go

internal/config/config_test.go

internal/config/testdata/config-local.yml

internal/config/testdata/config.yml

internal/mock/grpc_server.go

internal/mock/grpc_server_test.go

internal/mock/test_setup.go

internal/mock/testdata/config.yml

internal/server/handler.go

internal/server/handler_test.go

internal/server/http_gateway.go