Fix bug hidden on CI and make ci failed if tests failure (#29254)

The tests on migration tests failed but CI reports successfully


https://github.com/go-gitea/gitea/actions/runs/7364373807/job/20044685969#step:8:141

This PR will fix the bug on migration v283 and also the CI hidden
behaviour.

The reason is on the Makefile

`GITEA_ROOT="$(CURDIR)" GITEA_CONF=tests/mysql.ini $(GO) test
$(GOTESTFLAGS) -tags='$(TEST_TAGS)' $(MIGRATE_TEST_PACKAGES)` will
return the error exit code.

But 

`for pkg in $(shell $(GO) list
code.gitea.io/gitea/models/migrations/...); do \
GITEA_ROOT="$(CURDIR)" GITEA_CONF=tests/mysql.ini $(GO) test
$(GOTESTFLAGS) -tags '$(TEST_TAGS)' $$pkg; \
	done`

will not work.

This also fix #29602

models/migrations/fixtures/Test_AddRepoIDForAttachment/attachment.yml

@@ -0,0 +1,11 @@
+-
+  id: 1
+  uuid: a0eebc99-9c0b-4ef8-bb6d-6bb9bd380a11
+  issue_id: 1
+  release_id: 0
+
+-
+  id: 2
+  uuid: a0eebc99-9c0b-4ef8-bb6d-6bb9bd380a12
+  issue_id: 0
+  release_id: 1

models/migrations/fixtures/Test_AddRepoIDForAttachment/issue.yml

@@ -0,0 +1,3 @@
+-
+  id: 1
+  repo_id: 1

models/migrations/fixtures/Test_AddRepoIDForAttachment/release.yml

@@ -0,0 +1,3 @@
+-
+  id: 1
+  repo_id: 1