[mdatagen] add generated test to check config struct (#9438)

**Description:**
Add a generated test that checks the config struct using
`componenttest.CheckConfigStruct`.

.chloggen/add_generated_tests_check_config.yaml

@@ -0,0 +1,25 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: enhancement
+
+# The name of the component, or a single word describing the area of concern, (e.g. otlpreceiver)
+component: mdatagen
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Add a generated test that checks the config struct using `componenttest.CheckConfigStruct`
+
+# One or more tracking issues or pull requests related to the change
+issues: [9438]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:
+
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: []

cmd/mdatagen/templates/component_test.go.tmpl

@@ -54,6 +54,10 @@ func (aneh *assertNoErrorHost) ReportFatalError(err error) {
 }
 
 
+func TestCheckConfigStruct(t *testing.T) {
+	componenttest.CheckConfigStruct(NewFactory().CreateDefaultConfig())
+}
+
 {{ if isExporter }}
 func Test_ComponentLifecycle(t *testing.T) {
 	factory := NewFactory()