Makefile: run 'go mod tidy' before 'go mod vendor' (#2726)

## Changes
- Modify 'make' to first run 'go mod tidy', then 'go mod vendor'.
- Modify 'make build' to also run 'go mod tidy' before 'go mod vendor'.

## Why
It's a better sequence: 'go mod tidy' cleans up go.mod and go.sum and
'go mod vendor' populates vendor/ based on those. I also had errors when
'vendor' could not be run until 'tidy' is run.

Author: denik

Makefile

@@ -1,4 +1,4 @@
-default: vendor fmt lint tidy ws
+default: tidy vendor fmt lint ws
 
 PACKAGES=./acceptance/... ./libs/... ./internal/... ./cmd/... ./bundle/... .
 
@@ -40,7 +40,7 @@ showcover:
 acc-showcover:
 	go tool cover -html=coverage-acceptance.txt
 
-build: vendor
+build: tidy vendor
 	go build -mod vendor
 
 snapshot: