Fix SyntaxError crash line to show file, line, and column - #14899

SyntaxError crash lines now use the error's own file, line, and column instead of the location of the traceback entry where it was raised.

Before:

    E     File "package/lib.py", line 1
    E       def broken(:
    E                  ^
    E   SyntaxError: invalid syntax
    package/lib.py:1: SyntaxError

After:

    E     File "package/lib.py", line 1
    E       def broken(:
    E                  ^
    E   SyntaxError: invalid syntax
    package/lib.py:1:12: SyntaxError: invalid syntax

The traceback entry location and collection errors use the same file:line:col format. The ReprFileLocation dataclass gains an optional column field (column: int | None = None); existing output is unchanged when the field is absent.

Note: This PR doesn't solve the removal of the now-redundant File..., line N block. This is a deliberate design decision; it comes from stdlib format_exception_only(); deferred to a follow-up issue.

• Include documentation when adding new features.
• Include new tests or update existing tests when applicable.
• Allow maintainers to push and squash when merging my commits. Please uncheck this if you prefer to squash the commits yourself.
• Closes Format SyntaxErrors like Tracebacklines #2388
• If AI agents were used, they are credited in Co-authored-by commit trailers.
• Create a new changelog file in the changelog directory, with a name like <ISSUE NUMBER>.<TYPE>.rst. See changelog/README.rst for details.
• Add yourself to AUTHORS in alphabetical order.