Redundant `File ..., line N` block in SyntaxError output

[SemTiOne]

What's the problem this feature will solve?

Since #14899 the crash line already carries file:line:col, making the E-block's File/source/caret lines redundant:

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

Describe the solution you'd like

Omit the File block when the crash line carries the error's own file+line, keep it on the fallback path so no info is ever lost.

Alternative Solutions

Leave as is (stdlib default).

Additional context

Deferred from #14899. Related: #2388.