Removing the 'bootstrap' and 'popper.js' NuGet package references
that were used solely to copy assets to wwwroot/ at build time.
The npm-based esbuild bundles now provide the same files, and the
duplicate-asset build error is gone.
'bootstrap 5.3.8' (NuGet) was flagged with vulnerabilities by
Dependabot. Pinning to 4.6.2 via npm (matching what the views
were using from wwwroot/lib/) is closer to what the rest of the
codebase expects.
Verified: 'dotnet test' passes (11/11).
Refs: this is the fix to make the 'separate front assets into
esbuild bundles' commit green.
Paul Schneider
cef6002fef