Revert "test(e2e/windows): hermes update follows the store the desktop smoke settled on"

This reverts commit c7883282c91. On real Windows (runs 36293787001 and
36293789061, c7883282 + #124702), dropping HERMES_RUNTIME_DIR for the update
turned a 40-second red ("source launcher publication failed") into a silent
40-minute hang: the update finished its code, Desktop rebuild and skills
steps, printed the curator notice, and never exited until the job was
cancelled. The store it then used (<HERMES_HOME>\tools) was created by the
desktop smoke and never received the install's PM tools, so the update's
post-update default-tool install ran against a half-populated second store.
Both one-sided variants (keep the variable in the smoke; drop it for the
update) fail. The real fix is one store per leg, and it touches every
Windows leg, so it goes in on its own with a full Windows run.

tests/install/windows-e2e.ps1

@@ -489,25 +489,6 @@ function Invoke-HermesUpdate {
     # releases; ask the installed binary, never parse its source.
     $hermesExe = Get-SourceHermes $InstallDir
     $updateArgs = @("update")
-    # The desktop smoke runs the app without the job's HERMES_RUNTIME_DIR, the
-    # way a user's app runs, so it settles the install onto <HERMES_HOME>\tools
-    # and republishes .hermes\bin for that store's Python. Updating from that
-    # hermes.exe with the job's store back in scope made the update re-point
-    # its own running, locked launcher ("source launcher publication failed").
-    # Follow the store the install last settled on, as a user machine has one.
-    $jobRuntimeDir = $env:HERMES_RUNTIME_DIR
-    if ($jobRuntimeDir -and (Test-Path -LiteralPath (Join-Path $HermesHome "tools"))) {
-        Write-Host "  update runs on the install's own store ($HermesHome\tools), not HERMES_RUNTIME_DIR"
-        Remove-Item Env:HERMES_RUNTIME_DIR
-    }
-    try {
-        Invoke-HermesUpdateOnce $hermesExe $updateArgs
-    } finally {
-        if ($jobRuntimeDir) { $env:HERMES_RUNTIME_DIR = $jobRuntimeDir }
-    }
-}
-
-function Invoke-HermesUpdateOnce([string]$hermesExe, [string[]]$updateArgs) {
     $prevEap = $ErrorActionPreference; $ErrorActionPreference = "Continue"
     $helpText = & $hermesExe update --help 2>&1 | Out-String
     $helpExit = $LASTEXITCODE