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Re-work the GA cache naming to be more straight forward and efficient overall. The previously attached timestamping was actually working against us, and leading to much wasted cache usage.
At the same time, this adds 4 additional jobs to test
ubuntu-latestandmacos-latestrunners for both cmake and native autotools, which can help provide early detection of build issues on the newest runner OSes.A new workflow is also added that will function as a "cache maintenance" workflow to delete PR branch caches when a PR is closed/merged. This is primarily a step to prevent us from exceeding the cache storage size limit and having more useful caches evicted needlessly.
Finally, the last commit is a macOS-latest only workaround to address a bug on Apple's end which was introduced in Xcode 14.x when using a clang compiler version that doesn't match Xcode's own compiler version (which we do because the default bundled clang compilers have been shown to not work with our CMake build system).