feat(remote-build): new command logic

[mr-cal]

• Have you followed the guidelines for contributing?
• Have you signed the CLA?
• Have you successfully run make lint?
• Have you successfully run pytest tests/unit?

---

• Migrate the command logic used to orchestrate a remote build.
  • Some of this code was moved to a new class, RemoteBuild
• Store a copy of the project directory in the local cache
• Clean up the cache after a build completes
• Typing and linting updates

Builds on #4390, so "only" the last 8 commits are for this PR (update: #4390 was landed and this PR is rebased onto main). The new remote-build should be functional, so I encourage you to give it try.

Fixes #4324
(CRAFT-1979)

[codecov-commenter]

Codecov Report

Merging #4395 (84f1f3e) into main (5d19d28) will increase coverage by 0.05%.
The diff coverage is 97.88%.

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

@@            Coverage Diff             @@
##             main    #4395      +/-   ##
==========================================
+ Coverage   89.11%   89.16%   +0.05%     
==========================================
  Files         320      321       +1     
  Lines       21469    21606     +137     
==========================================
+ Hits        19132    19266     +134     
- Misses       2337     2340       +3     

Files	Coverage Δ
snapcraft/commands/remote.py	98.77% <100.00%> (+0.43%)	⬆️
snapcraft/legacy_cli.py	55.55% <100.00%> (ø)
snapcraft/remote/__init__.py	100.00% <100.00%> (ø)
snapcraft/remote/errors.py	100.00% <100.00%> (ø)
snapcraft/remote/git.py	100.00% <100.00%> (ø)
snapcraft/remote/remote_builder.py	100.00% <100.00%> (ø)
snapcraft/remote/utils.py	96.07% <100.00%> (+2.74%)	⬆️
snapcraft/remote/launchpad.py	87.40% <92.59%> (-0.54%)	⬇️
snapcraft/remote/worktree.py	88.88% <91.30%> (ø)

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[lengau]

I've made two suggestions about typing in launchpad.py, but I haven't actually tried them to know whether both mypy and pyright will behave with them, and frankly there's no need for them.

[cmatsuoka]

Awesome, thanks!