Fix: no trailing comma in multi-line signatures by default

[TLouf]

Subject: no trailing comma in multi-line signatures by default

• C and C++ domains will never feature a trailing comma as it'd correspond to incorrect syntax.
• Python and JS get a new config value to optionally disable the trailing comma (for now enabled by default for backwards compatibility)

Feature or Bugfix

• Bugfix

Relates

• HTML5/Latex/Text writers: Trailing comma in multi-line signatures #12902

[picnixz]

@TLouf Can you fix the conflicts and then request me for review please?

[TLouf]

@picnixz Done, I think this is ready for review.

[picnixz]

Do you want to add tests for PEP 695 as well or do you want me to take care of that later (I don't know when)?

[TLouf]

Do you want to add tests for PEP 695 as well or do you want me to take care of that later (I don't know when)?

I've just added one for the HTML writer, but since there isn't any for the text writer I'm not sure whether to add both the base test for maximum_signature_line_length and another for the trailing comma here.

[picnixz]

I forgot about this PR, but this looks good. Can you resolve the conflicts please? (most of the conflicts arise because we are formatting everything now so you can run the make rule to autoformat this (I don't remember which one))