Test infrastructure overhaul

[0152la]

Previously, we were using run_test.sh to copy over and execute the files on a CHERI machine. However, as the library evolved, tests also evolved to require multi-file dependencies to be copied over, and argument handling. This PR replaces the old shell script with a new run_test.py, which has better support for arguments and dependencies, and keeps these better contained within cmake definitions

It does add one dependency, python fabric [1], for ssh operations.

[1] https://www.fabfile.org/

[ltratt]

bors r+

[bors[bot]]

Build failed:

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[0152la]

bors try

[bors[bot]]

try

Build failed:

• buildbot/ci-builder

[0152la]

bors try

[bors[bot]]

try

Build failed:

• buildbot/ci-builder

[0152la]

bors try

[bors[bot]]

try

Build failed:

• buildbot/ci-builder

[0152la]

bors try

[bors[bot]]

try

Build failed:

• buildbot/ci-builder

[0152la]

bors try

[bors[bot]]

try

Build succeeded!

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• buildbot/ci-builder

[0152la]

Ready for review.

[ltratt]

Please squash.

[0152la]

Squashed.

[ltratt]

bors r+

[bors[bot]]

Build succeeded!

The publicly hosted instance of bors-ng is deprecated and will go away soon.

If you want to self-host your own instance, instructions are here. For more help, visit the forum.

If you want to switch to GitHub's built-in merge queue, visit their help page.

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