ci: install ts-web/core package first

[pro-wh]

fixes #291

seems npm now runs 'lifecycle scripts' during workspace install npm/cli#2900 npm/arborist@5a4c106. from convenient, no? we save a few npm run prepare steps.

but it does kind of a shoddy job of it. it runs all the packages' prepare scripts at the same time, concurrently. however, other dev tools we use, such as tsc, rely on dependencies already being built, so this broke things for us.

for now, we manually encode that core is lower (?) in the dependency graph and manually do that first. then we install the other packages, although I'm pretty sure that recompiles core 🙄

[codecov]

Codecov Report

Merging #292 (8527aa1) into main (f14c6b6) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #292   +/-   ##
=======================================
  Coverage   70.70%   70.70%           
=======================================
  Files          57       57           
  Lines        3455     3455           
=======================================
  Hits         2443     2443           
  Misses        992      992           
  Partials       20       20           

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