Move matplotlib tests to specific folder

tests/scipy-notebook/data/matplotlib/matplotlib_fonts_1.py

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+# Matplotlit: Test tex fonts
+import matplotlib
+import matplotlib.pyplot as plt
+import os
+
+matplotlib.rcParams["pgf.texsystem"] = "pdflatex"
+matplotlib.rcParams.update(
+    {
+        "font.family": "serif",
+        "font.size": 18,
+        "axes.labelsize": 20,
+        "axes.titlesize": 24,
+        "figure.titlesize": 28,
+    }
+)
+matplotlib.rcParams["text.usetex"] = True
+
+fig, ax = plt.subplots(1, 1)
+x = [1, 2]
+y = [1, 2]
+ax.plot(x, y, label="a label")
+ax.legend(fontsize=15)
+
+file_path = os.path.join("/tmp", "test_fonts.png")
+fig.savefig(file_path)
+print(f"File {file_path} saved")