TST: Remove redundant font tests

- `test_backend_ps::test_type3_font` is covered by
  `test_backend_ps::test_multi_font_type3`
- `test_text::test_pdf_chars_beyond_bmp` is covered by
  `test_backend_pdf::test_multi_font_type3` and
  `test_backend_pdf::test_multi_font_type42`
- `test_text::test_pdf_kerning` is covered by
  `test_backend_pdf::test_kerning`
- `test_text::test_pdf_type42_kerning` is covered by
  `test_backend_pdf::test_kerning`

Author: QuLogic

lib/matplotlib/tests/baseline_images/test_backend_ps/type3.eps

@@ -217,11 +217,6 @@ def test_useafm():
     ax.text(.5, .5, "qk")
 
 
-@image_comparison(["type3.eps"])
-def test_type3_font():
-    plt.figtext(.5, .5, "I/J")
-
-
 @image_comparison(["coloredhatcheszerolw.eps"])
 def test_colored_hatch_zero_linewidth():
     ax = plt.gca()

lib/matplotlib/tests/baseline_images/test_text/text_pdf_chars_beyond_bmp.pdf

@@ -840,12 +840,6 @@ def test_invalid_color():
         plt.figtext(.5, .5, "foo", c="foobar")
 
 
-@image_comparison(['text_pdf_kerning.pdf'], style='mpl20')
-def test_pdf_kerning():
-    plt.figure()
-    plt.figtext(0.1, 0.5, "ATATATATATATATATATA", size=30)
-
-
 # See gh-26152 for more information on this xfail
 @pytest.mark.xfail(pyparsing_version.release == (3, 1, 0),
                    reason="Error messages are incorrect with pyparsing 3.1.0")
@@ -876,21 +870,6 @@ def test_parse_math_rcparams():
         fig.canvas.draw()
 
 
-@image_comparison(['text_pdf_font42_kerning.pdf'], style='mpl20')
-def test_pdf_font42_kerning():
-    plt.rcParams['pdf.fonttype'] = 42
-    plt.figure()
-    plt.figtext(0.1, 0.5, "ATAVATAVATAVATAVATA", size=30)
-
-
-@image_comparison(['text_pdf_chars_beyond_bmp.pdf'], style='mpl20')
-def test_pdf_chars_beyond_bmp():
-    plt.rcParams['pdf.fonttype'] = 42
-    plt.rcParams['mathtext.fontset'] = 'stixsans'
-    plt.figure()
-    plt.figtext(0.1, 0.5, "Mass $m$ \U00010308", size=30)
-
-
 @needs_usetex
 def test_metrics_cache():
     mpl.text._get_text_metrics_with_cache_impl.cache_clear()