chore: enable forcetypeassert linter, fix issues (#38804)

Enable [`forcetypeassert`](https://github.com/gostaticanalysis/forcetypeassert)
linter to prevent unchecked type assertions. ~650 issues fixed, most
fixes were clean, some use `setting.PanicInDevOrTesting`.

The only behaviour changes are where code would previously send a 500 error
or panic, a 4xx error is now emitted.

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

tests/integration/api_packages_conan_test.go

@@ -23,6 +23,7 @@ import (
 	"gitea.dev/tests"
 
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
 const (
@@ -327,8 +328,8 @@ func TestPackageConan(t *testing.T) {
 				assert.Nil(t, pd.SemVer)
 				assert.Equal(t, name, pd.Package.Name)
 				assert.Equal(t, version1, pd.Version.Version)
-				assert.IsType(t, &conan_module.Metadata{}, pd.Metadata)
-				metadata := pd.Metadata.(*conan_module.Metadata)
+				metadata, ok := pd.Metadata.(*conan_module.Metadata)
+				require.True(t, ok)
 				assert.Equal(t, conanLicense, metadata.License)
 				assert.Equal(t, conanAuthor, metadata.Author)
 				assert.Equal(t, conanHomepage, metadata.ProjectURL)