LT-20524: Resolve install directories in silent (/quiet) installs

[johnml1135]

Problem

LT-20524 — applications built
on this installer (for example FieldWorks) fail to install in /quiet
mode (PDQ Deploy / PDQ Connect / Intune).

The directory-resolution custom actions (SetDefDataFolder,
VerifyDataPath, and the Use*AppFolder / Use*DataFolder /
Use*HarvestDataFolder set) were scheduled only in the
InstallUISequence. Windows Installer skips that sequence for silent
(/quiet, /qn) and basic-UI (/qb) installs, so APPFOLDER,
DATAFOLDER, and HARVESTDATAFOLDER were never assigned. The
application and its harvested data then installed to the wrong
locations. For FieldWorks, that also broke ICU_DATA resolution and
caused a crash on first use. /passive worked only because it still ran
the reduced-UI sequence.

Fix

Schedule the same directory-resolution actions in the
InstallExecuteSequence, guarded by UILevel < 4 so they run only
when the UI sequence is skipped. Reduced (/passive) and full UI
installs continue to resolve these in the InstallUISequence, so a
user-chosen path is never overridden. VerifyDataPath populates
REGDATAFOLDER (used by the conditions) and always returns Success,
so it is safe in a silent install.

This is the corresponding legacy WiX 3 change for the paired FieldWorks
WiX 6 PR: sillsdev/FieldWorks#937.

Validation

• WiX authoring is schema-valid (no XML/WiX validation errors).
• Downstream validation was completed in the paired FieldWorks PR on the
  rebuilt WiX 6 MSI with elevated installs for /quiet, /qb,
  /passive, and full UI. In each successful mode, the app folder,
  data folder, harvested-data folder, and shortcuts resolved correctly.
• Direct legacy WiX 3 / genericinstaller smoke validation was not
  run in this workspace, so repo-local WiX 3 evidence is still pending.

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This change is 

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Adds directory-resolution custom actions to the InstallExecuteSequence for silent/basic MSI installs, ensuring installation paths (APPFOLDER/DATAFOLDER/HARVESTDATAFOLDER) are set correctly when the UI sequence does not run.

Changes:

• Schedules directory resolution custom actions under UILevel < 4 in InstallExecuteSequence.
• Introduces guarded sequencing for default/override/registry-derived folder selection during silent/basic installs.

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[jasonleenaylor]

@jasonleenaylor reviewed 1 file and all commit messages, and made 1 comment.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on johnml1135).