Gotestsum (#22826)

* disable coverage

This reduces runtime of the server test suite from ~30m to ~10m, and as far as I can see: we discarded the coverage output anyway.

* allow morph 60s to migrate when running tests

* scripts/test.sh: drop COVERMODE

Stop generating coverage data when running unit tests. It's likely we'll want this data back at some point, but for now it's unused and removing simplifies invoking tests for developers.

* scripts/test.sh: remove cleanup steps

* scripts/test.sh: drop TESTS parameter

* scripts/test.sh: drop TESTFLAGS parameter

* switch to gotestsum

.github/workflows/server-ci-template.yml

@@ -230,29 +230,37 @@ jobs:
     needs: check-mattermost-vet
     uses: ./.github/workflows/server-test-template.yml
     with:
+      name: Postgres with binary parameters
       datasource: postgres://mmuser:mostest@postgres:5432/mattermost_test?sslmode=disable&connect_timeout=10&binary_parameters=yes
       drivername: postgres
+      logsartifact: postgres-binary-server-test-logs
   test-postgres-normal:
     name: Postgres
     needs: check-mattermost-vet
     uses: ./.github/workflows/server-test-template.yml
     with:
+      name: Postgres
       datasource: postgres://mmuser:mostest@postgres:5432/mattermost_test?sslmode=disable&connect_timeout=10
       drivername: postgres
+      logsartifact: postgres-server-test-logs
   test-mysql:
     name: MySQL
     needs: check-mattermost-vet
     uses: ./.github/workflows/server-test-template.yml
     with:
+      name: MySQL
       datasource: mmuser:mostest@tcp(mysql:3306)/mattermost_test?charset=utf8mb4,utf8&multiStatements=true&maxAllowedPacket=4194304
       drivername: mysql
+      logsartifact: mysql-server-test-logs
   test-mmctl:
     name: Run mmctl tests
     needs: check-mattermost-vet
     uses: ./.github/workflows/mmctl-test-template.yml
     with:
+      name: mmctl
       datasource: postgres://mmuser:mostest@postgres:5432/mattermost_test?sslmode=disable&connect_timeout=10
       drivername: postgres
+      logsartifact: mmctl-test-logs
   build-mattermost-server:
     name: Build mattermost server app
     runs-on: ubuntu-latest-8-cores