Drop a test that has not been used since it was committed

This test has been dead code since its introduction and does not get
executed by pytest due to starting with `text` rather than `test`. The
underlying data for this test is also non-trivial to update and
dependent on the specific Python version.

Since this is already dead code and is non-trivial to update, removing
this test more clearly reflects what happens with this dead code in
tests and prevents potential confusion due to its presence.

tests/test_traceback.py

@@ -9,14 +9,6 @@
 from rich.theme import Theme
 from rich.traceback import Traceback, install
 
-# from .render import render
-
-try:
- from ._exception_render import expected
-except ImportError:
- expected = None
-
-
 CAPTURED_EXCEPTION = 'Traceback (most recent call last):\n╭──────────────────────────────────────────────────────────────────────────────────────────────────╮\n│ File "/Users/textualize/projects/rich/tests/test_traceback.py", line 26, in test_handler │\n│ 23 try: │\n│ 24 old_handler = install(console=console, line_numbers=False) │\n│ 25 try: │\n│ ❱ 26 1 / 0 │\n│ 27 except Exception: │\n│ 28 exc_type, exc_value, traceback = sys.exc_info() │\n│ 29 sys.excepthook(exc_type, exc_value, traceback) │\n╰──────────────────────────────────────────────────────────────────────────────────────────────────╯\nZeroDivisionError: division by zero\n'
 
 
@@ -70,11 +62,6 @@ def level2():
  assert old_handler == expected_old_handler
 
 
-def text_exception_render():
- exc_render = render(get_exception())
- assert exc_render == expected
-
-
 def test_capture():
  try:
  1 / 0
@@ -342,12 +329,3 @@ def level3():
  assert len(frames) == expected_frames_length
  frame_names = [f.name for f in frames]
  assert frame_names == expected_frame_names
-
-
-if __name__ == "__main__": # pragma: no cover
- expected = render(get_exception())
-
- with open("_exception_render.py", "wt") as fh:
- exc_render = render(get_exception())
- print(exc_render)
- fh.write(f"expected={exc_render!r}")