refact(all): Use testing.TB for test helpers

Our test helper packages were not possible to use
with benchmarks. This refactor switches to testing.TB
to allow both tests and benchmarks to use the helpers.

internal/plugin/testing.go

@@ -41,7 +41,7 @@ func (c *plugin) SetTableName(n string) {
 	c.tableName = n
 }
 
-func testPlugin(t *testing.T, conn *db.DB, name string) *plugin {
+func testPlugin(t testing.TB, conn *db.DB, name string) *plugin {
 	t.Helper()
 	p := newPlugin(name)
 	id, err := db.NewPublicId("plg")