pwiz: Added a vendor-bundled installer variant for offline installs

[chambm]

Summary

Stacked on #4640 — review that one first; this PR's diff is only the six files below.

A third installer variant that needs no network at run time, which is what the net10 Wine
container needs and what an offline or air-gapped site install needs.

• build.ps1 -WithVendorSdks produces ProteoWizard-WithVendorSdks-Setup-<ver>.exe
  (103.8 MB): the bundled-runtime installer plus every Windows vendor SDK, pre-extracted
  into exactly the layout VendorSdkLoader.EnsureExtracted would have produced on first use,
  .ok markers included, so the loader neither downloads nor extracts. The name says only
  what it adds over the default variant — it carries the .NET runtime too.
• Setup.iss installs that cache to %PROGRAMDATA%\ProteoWizard\vendor and stamps
  vendor-cache-root.txt beside it. The loader's default cache root is per-user
  (%LOCALAPPDATA%), and writing the marker is what redirects it to the shared bundled copy.
  The cache is keyed by SDK version rather than by app version, so it is deliberately left
  behind on uninstall.
• --with-vendor-sdks through build.bat and tcbuild.bat. Opt-in: CI builds the
  variant, a developer build does not pay the ~30 s / ~26 MB.
• Installer.Tests extended from 4 fixtures across 3 vendors to 9 across 8, and made to
  accumulate failures rather than abort on the first. This is what found the four
  vendor-resolution bugs in pwiz: Fixed four vendor readers failing from an installer-based install #4640 — nothing before it exercised a real install.
• Renamed ProteoWizard-Sharp to ProteoWizard across the installer: product name, all
  three output filenames, the Linux tarballs, and the test's discovery glob.

Verified end to end in the wine 11 container: installing this artifact and converting with
--network none works for all 8 vendors, so nothing reaches raw.githubusercontent.com.

Test plan

• pwiz-sharp/build.bat Release --i-agree-to-the-vendor-licenses --with-vendor-sdks — all three installers produced (78.2 / 21.5 / 103.8 MB), every suite green
• All three build.bat arg paths (default, --with-vendor-sdks, no --i-agree)
• Installer.Tests per-user fixture — 9 fixtures across 8 vendors, from the real installer artifact
• 43-pair vendor sweep in the wine 11 container with --network none: 43/43 converted, 40/43 count-match
• ABI/Sciex offline check in the same image: 4/4 converted, 11 count-matches
• Install_PerMachine_DeploysAndConvertsVendorFile is skipped locally — it needs elevation

Co-Authored-By: Claude noreply@anthropic.com