fix: Correct pyarrow installation check and add bazel troubleshooting

[esafak]

I made a mistake in #2396 when I changed

func = pytest.mark.fory_format(func)
arrow_installed = False
if pa is not None and hasattr(pa, "get_library_dirs"):
    arrow_installed = True
func = pytest.mark.skipif(not arrow_installed, reason="pyarrow not installed")(func)
return func

to

arrow_not_installed = pa is None or hasattr(pa, "get_library_dirs")
mark_decorator = pytest.mark.skipif(arrow_not_installed, reason="pyarrow not installed")(func)
return mark_decorator

The second condition, hasattr(pa, "get_library_dirs"), should have been negated. I noticed this when arrow tests were incorrectly being skipped :|

What does this PR do?

• Fix incorrect pyarrow installation check in core.py
• Add troubleshooting steps for bazel caching issues in README.md