Try to work around following error on some of the Linux CI:
```
8: (lldb) settings set -f frame-format "custom-frame '${function.basename}'\n"
check:50'0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
check:50'1 ? possible intended match
9: (lldb) break set -l 5
check:50'0 ~~~~~~~~~~~~~~~~~~~~~~
10: error: No selected frame to use to find the default file.
check:50'0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
11: error: No file supplied and no default file available.
check:50'0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
12: (lldb) exit
check:50'0 ~~~~~~~~~~~~
```
Fails on Windows CI:
```
| 10: (lldb) break set -l 3
| check:30'0 ~~~~~~~~~~~~~~~~~~~~~~
| 11: error: No selected frame to use to find the default file.
| check:30'0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| 12: error: No file supplied and no default file available.
| check:30'0 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| 13: (lldb) exit
```
This passes fine when compiling on Windows for Linux targets.
All of these were failing on Windows CI. Some are failing because
breakpoints on template functions can't be set by name. Others are
failing because of slight textual differences. Most are failing because
we can't track components of a mangled name from PDB, so XFAIL those.
Adds the new `plugin.cplusplus.display.function-name-format` setting and makes the `${function.name-with-args}` query it for formatting the function name.
One caveat is that the setting can't itself be set to `${function.name-with-args}` because that would cause infinite recursion and blow the stack. I added an XFAILed test-case for it and will address it in a follow-up patch.
https://github.com/llvm/llvm-project/pull/131836
