Fix truncated warning descriptions in emacs output format

[Copilot]

Issue

When similar warnings are grouped in the emacs output format, their descriptions were being truncated with ..., making the output less useful. For example, warnings like This format specifier for type ' ... were being displayed instead of the full message like This format specifier for type 'int' does not match the argument type 'unsigned long'.

Changes Made

• Modified the emacs output template to show the complete description for each warning instead of using the truncated key used for grouping
• Added a condition to only show the description if it exists and is different from the code, preventing duplicate text
• Updated tests to match the new output format

Example

Before:

Severity : error [1]
dir/abc.c:506: cpp/wrong-type-format-argument This format specifier for type ' ...
dir/def.c:107: cpp/wrong-type-format-argument This format specifier for type ' ...

After:

Severity : error [1]
dir/abc.c:506: cpp/wrong-type-format-argument This format specifier for type 'int' does not match the argument type 'unsigned long'.
dir/def.c:107: cpp/wrong-type-format-argument This format specifier for type 'float' does not match the argument type 'double'.

Fixes #86.

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