Add tests for syntax checking training scripts

tests/test_fine_tune.py

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+import fine_tune
+
+
+def test_syntax():
+    # Very simply testing that the train_network imports without syntax errors
+    assert True

tests/test_flux_train.py

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+import flux_train
+
+
+def test_syntax():
+    # Very simply testing that the train_network imports without syntax errors
+    assert True

tests/test_flux_train_network.py

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+import flux_train_network
+
+def test_syntax():
+    # Very simply testing that the flux_train_network imports without syntax errors
+    assert True

tests/test_sd3_train.py

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+import sd3_train
+
+
+def test_syntax():
+    # Very simply testing that the train_network imports without syntax errors
+    assert True

tests/test_sd3_train_network.py

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+import sd3_train_network
+
+def test_syntax():
+    # Very simply testing that the flux_train_network imports without syntax errors
+    assert True

tests/test_sdxl_train.py

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+import sdxl_train
+
+
+def test_syntax():
+    # Very simply testing that the train_network imports without syntax errors
+    assert True

tests/test_sdxl_train_network.py

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+import sdxl_train_network
+
+
+def test_syntax():
+    # Very simply testing that the train_network imports without syntax errors
+    assert True

tests/test_train.py

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+import train_db
+
+
+def test_syntax():
+    # Very simply testing that the train_network imports without syntax errors
+    assert True

tests/test_train_network.py

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+import train_network
+
+def test_syntax():
+    # Very simply testing that the train_network imports without syntax errors
+    assert True

tests/test_train_textual_inversion.py

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+import train_textual_inversion
+
+def test_syntax():
+    # Very simply testing that the train_network imports without syntax errors
+    assert True