fix issues installing software in windows (#19048)

for #19039 and #19041 this:

- fixes the install/remove scripts to read the env variable the proper
way
- truncates output before storing in the databse in case its longer than
MySQL's TEXT size

# Checklist for submitter

If some of the following don't apply, delete the relevant line.

<!-- Note that API documentation changes are now addressed by the
product design team. -->

- [x] Added/updated tests
- [x] Manual QA for all new/changed functionality

pkg/file/scripts/install_exe.ps1

@@ -1,4 +1,4 @@
-$exeFilePath = "$INSTALLER_PATH"
+$exeFilePath = "${env:INSTALLER_PATH}"
 
 # extract the name of the executable to use as the sub-directory name
 $exeName = [System.IO.Path]::GetFileName($exeFilePath)

pkg/file/scripts/install_msi.ps1

@@ -1,7 +1,7 @@
 $logFile = "${env:TEMP}/fleet-install-software.log"
 
 $installProcess = Start-Process msiexec.exe `
-  -ArgumentList "/quiet /norestart /lv ${logFile} /i `"$INSTALLER_PATH`"" `
+  -ArgumentList "/quiet /norestart /lv ${logFile} /i `"${env:INSTALLER_PATH}`"" `
   -PassThru -Verb RunAs -Wait
 
 Get-Content $logFile -Tail 500

pkg/file/scripts/remove_exe.ps1

@@ -1,4 +1,4 @@
-$exeFilePath = "$INSTALLER_PATH"
+$exeFilePath = "${env:INSTALLER_PATH}"
 
 # extract the name of the executable to use as the sub-directory name
 $exeName = [System.IO.Path]::GetFileName($exeFilePath)

pkg/file/scripts/remove_msi.ps1

@@ -1,7 +1,7 @@
 $logFile = "${env:TEMP}/fleet-remove-software.log"
 
 $removeProcess = Start-Process msiexec.exe `
-  -ArgumentList "/quiet /norestart /lv ${logFile} /x `"$INSTALLER_PATH`"" `
+  -ArgumentList "/quiet /norestart /lv ${logFile} /x `"${env:INSTALLER_PATH}`"" `
   -PassThru -Verb RunAs -Wait
 
 Get-Content $logFile -Tail 500