[WIP] Remove hardcoding of gcc-13 for flexibility

[Copilot]

Thanks for assigning this issue to me. I'm starting to work on it and will keep this PR's description up to date as I form a plan and make progress.

Original prompt

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This section details on the original issue you should resolve

<issue_title>don't hardcode gcc-13</issue_title>
<issue_description>As I understand it, this was done because support for the c++23 standard is required. If there is a more recent system GCC (or perhaps also clang?) available though, the recipes should probably just use that. The fact that gcc-13 is hardcoded in a bunch of places makes it hard to override in favor of the system GCC. In the end, I ended up creating wrapper scripts called gcc-13 and g++-13 inside ironenv/bin that simply call the system GCC as a workaround and I confirmed that GCC 15 worked just as well.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes don't hardcode gcc-13 #2769

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