feat: add Linux support

[pendo324]

Issue #, if available:

Description of changes:
Adds Linux support to Finch by creating a new "native" code path that doesn't use Lima and instead relies on the system packages for nerdctl/containerd/etc. being properly configured.

TODO in this PR:

• Fix e2e tests
• Add environment variable overrides for nerdctl config and buildkit socket paths

Because this diff is already huge, TODO in followup PR(s):

• Add e2e tests for Linux
  • Right now, they're all excluded from building to avoid fixing lint errors and refactoring
• Increase Linux/native specific unit test coverage: test(linux): add unit tests for files which were refactored for Linux support #1058
• Fix semantics around what toggling the soci snapshotter or ecr-credential-helper actually means on Linux (e.g. toggling environment variables or config files)
• Fix what logs a support bundle should include on Linux (e.g. dumping journalctl)

Testing done:

• I've reviewed the guidance in CONTRIBUTING.md

License Acceptance

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[pendo324]

squash the commits may be unless they have actual feat that are separable

We do that automatically on merge

will finch run all its command as sudo?

Finch itself doesn't have to run commands as sudo, but right now since we don't support rootless, user's will need to either be root, use setuid, or run sudo finch for Finch to read it's config file and execute nerdctl commands successfully

[henry118]

LGTM in general, can you address the test failures?

[pendo324]

LGTM in general, can you address the test failures?

Re-ran the tests