Loader: Fix machine hang when loading the hypervisor

[chp-io]

This patch fixes an issue where the machine would hang when trying to load the hypervisor. This would occur if the cmake HYPERVISOR_TARGET_ARCH variable is set to a different target architecture than the architecture of the machine it is being compiled and tested on, bypassing the CPU checks that are done in the loader.

This patch set also includes other minor improvements, such as:

• ability to trigger CI on any branch
• cmake will now warn if a dependency of this project is not at the expected git tag version. i.e. when cmake is configured with -DFETCHCONTENT_SOURCE_DIR_BSL=<local_path_to_bsl>

[codecov[bot]]

Codecov Report

Merging #975 (d2030b6) into master (8ad8e34) will not change coverage. The diff coverage is n/a.

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  Coverage   100.00%   100.00%           
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  Files          572       572           
  Lines        50886     50886           
  Branches      1225      1225           
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  Hits         50886     50886