feat: add a --list flag to alr test

[AldanTanneo]

The --list flag outputs a list (well, a map in structured output mode) of tests matching the input filter. This allows external tools (such as the ada_language_server) to discover ahead of time what tests are available, and potentially to offer users to run them.

[AldanTanneo]

Maybe the issue with the 'corrupted linked list' is that gcc-13 and the system glibc (on ubuntu latest) are mismatched?

[mosteo]

Maybe the issue with the 'corrupted linked list' is that gcc-13 and the system glibc (on ubuntu latest) are mismatched?

I hadn't never seen this up to the particular PR where it started. It is also always the same test. So it seems to be something obscure but reproducible. I would expect such a mismatch to be more evident sooner? But I don't really know.

[AldanTanneo]

Hm actually in the current form this will output the list for the first declared alire runner and then bailout... I should add some checks when using the flag 🤔

[Fabien-Chouteau]

Looks good to me as is.

There's one thing I would do to make this more future proof, Get_File_List should return a list/array of records with more info than only a path. Of course I am thinking about my #1935 proposal here, but beyond that it makes sense to compute the display name, source path, bin path, in a single place.

[AldanTanneo]

I will make a followup PR to change the format of both the structured test output and the structured test list output then. (I implemented the structured output as an object instead of just a string for potentially adding fields in the future, so this was on my mind 👍)