Shadowing parent variables in `VAR_TEMP` blocks

[mhasel]

should we allow shadowing parent variables with temp vars ?

FUNCTION_BLOCK fb
VAR
    x: INT := 10;
END_VAR
END_FUNCTION_BLOCK

FUNCTION_BLOCK fb2 EXTENDS fb
// the following var-block will currently cause a compile error
VAR_TEMP 
     x: INT := 20;
END_VAR
END_FUNCTION_BLOCK

         I would lean towards yes, but maybe track this in a separate issue to discuss there?

Originally posted by @volsa in https://github.com/PLC-lang/rusty/pull/1445#discussion_r2035192899

[ghaith]

I say yes with a warning