[8.x](backport #6866) fix install prevention on Linux #6921
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What does this PR do?
go-sysinfo
determines native architecture based on/proc
filesystem which could be disabled, therefore the prevention should err on allowing installation when native architecture is unknown.The fixed prevention was not included in any released version yet.
Why is it important?
Agent prevents adding Elastic Defend when it cannot determine if it's being emulated. However it's fine to install Elastic Defend in such case, as it does emulation check on it's own upon installation returning installation error when appropriate.
Checklist
./changelog/fragments
using the changelog toolRelated issues
This is an automatic backport of pull request #6866 done by [Mergify](https://mergify.com).