👷 Restore self-hosted runner for certain CI tasks

[aaronleopold]

This PR reintroduces my self-hosted actions runner for the majority of rust CI tasks, excluding the binary release workflow. The highlights include:

• Refactor the coverage tasks into a separate composite action
• Adjust the path filters for the CI workflows to be more specific to the job's domain (e.g. rust changes for rust tasks, etc)
• Fix issue on my runner relating to docs tests where hard crashes happened when attempting to run them
• Add step to enforce up-to-date bindings have been generated

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Files	Coverage Δ
apps/server/src/middleware/auth.rs	0.00% <ø> (ø)
core/src/context.rs	0.00% <ø> (ø)
core/src/filesystem/content_type.rs	82.90% <100.00%> (+45.20%)	⬆️
core/src/lib.rs	0.00% <ø> (ø)
core/src/opds/v1_2/author.rs	100.00% <ø> (ø)
crates/email/src/emailer.rs	0.00% <ø> (ø)
crates/email/src/template.rs	100.00% <ø> (ø)

[aaronleopold]

I'm going to merge this in to unblock the nightly CI, but I'll want to revisit for additional testing before the next release