Switch to pnpm and force its usafe for UI - Remove npm calls from build.rs

[jsuereth]

This Fixes a few things in the build.

• First it forces a specific version for node and using pnpm as a package manager.
• Second, it only issues warnings from build.rs if node is not build, and warnings if it is not up to date. It should not longer try to call node executables from inside cargo.
• Last, it tries to do more fine-grained detection of staleness checks in build.rs to give better guidance on what you need to call to fix things.

[jsuereth]

@jerbly Could really use your help trying this out.

If I've done this right, then you should have nothing to change because you're on LTS of node. Additionally, any machine that's on a different version will fallback to using docker to pull in the LTS version of node.

PTAL and let me know what you think!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.0%. Comparing base (635c682) to head (788b459).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #1173   +/-   ##
=====================================
  Coverage   79.9%   80.0%           
=====================================
  Files        109     109           
  Lines       8586    8586           
=====================================
+ Hits        6868    6869    +1     
+ Misses      1718    1717    -1     

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[jerbly]

@jsuereth - To have npm ci work I had to match the exact version of npm that's in the docker container, 11.6.2. This is a slightly old version. On 11.8.0, the latest, npm ci fails and therefore falls back to the docker container to build.
So, I would guess that we'll end up always building with the docker container since the version matching seems so exact.

[jerbly]

LGTM