[CI] Fix Speech CI Validation Messages (#6827)

Signed-off-by: Alex Brooks <albrooks@redhat.com>

tests/dfx/reliability/invalid_param_test/test_invalid_audio_diffusion.py

@@ -70,10 +70,14 @@ _PARAMS = [
         pytest.param({"guidance_scale": -1.0}, "guidance_scale", id="guidance_scale_negative", marks=_SKIP_ISSUE_3649),
         pytest.param({"guidance_scale": 0}, "guidance_scale", id="guidance_scale_zero", marks=_SKIP_ISSUE_3649),
         pytest.param(
-            {"num_inference_steps": 0}, "num_inference_steps", id="num_inference_steps_zero", marks=_SKIP_ISSUE_3649
+            {"num_inference_steps": 0},
+            ("num_inference_steps", "greater than or equal to 1"),
+            id="num_inference_steps_zero",
         ),
         pytest.param(
-            {"num_inference_steps": -1}, ("number of steps", "non-negative"), id="num_inference_steps_negative"
+            {"num_inference_steps": -1},
+            ("num_inference_steps", "greater than or equal to 1"),
+            id="num_inference_steps_negative",
         ),
         pytest.param(
             {"num_inference_steps": 6000},

tests/dfx/reliability/invalid_param_test/test_invalid_audio_speech.py

@@ -157,7 +157,13 @@ def test_speech_missing_required_fields(omni_server: OmniServer, online_client:
                 "ref_audio": None,
                 "ref_text": None,
             },
-            ("Invalid voice", "vivian"),
+            # NOTE: This is delegating down the TTS adapter, so the message is both specific
+            # to the Qwen3TTS adapter and dependent on whether or not the model has any speakers
+            # (as opposed to having valida speakers, but getting an invalid speaker). it would
+            # be more ideal to validate that this is landing on `.validate()` on the adapter
+            # and ensuring that the returned message matches what we would get from calling the
+            # adapter validate directly.
+            ("no speakers configured",),
             id="customvoice_invalid_voice",
         ),
         pytest.param(