Fix several bugs with nudge v1.1.2

[erikng]

• Add logic for attemptToFetchMajorUpgrade and getBackupMajorUpgradeAppPath()
  • Addresses attemptToFetchMajorUpgrade is unused #278 and Launching available installers, despite deferral. #281
• Point to a specific macos update like nudge-python
  • Addresses Point Nudge to specific update #279
• Allow self service macOS major upgrades - feature request: Allow serf service MDM options for major upgrades #285
• Fix main content text getting cut off when not using screen shots. This was a regression caused by a PR from our community
  • Addresses mainContentText view gets cut (scroll) #273
• Fix normalization issue when using a patch level of .0 on a requiredMinimumOSVersion key
  • Addresses requiredMinimumOSVersion is not Normalizing 11.6.0 on macOS 11.6 #257

[erikng]

PR should now address #279 and #285 as well

[erikng]

#273 is now fixed with this PR

[erikng]

PR now fixes #257

[erikng]

From @colorenz

I have successfully tested the following cases.

Test 0 😄
actionButtonPath set
Works

Test 1.
attemptToFetchMajorUpgrade -> false
majorUpgradeAppPath is set .../Downloads/Install\ macOS\ Monterey.app
Works ; Installer opens after a click on Update Device

Test 2.
attemptToFetchMajorUpgrade -> false
majorUpgradeAppPath is set not set
Installer is present in Applications (Backuppath)
Works ; Installer opens after a click on Update Device

Test 3.
attemptToFetchMajorUpgrade -> false
majorUpgradeAppPath is set not set
Installer is present in Applications (Backuppath)
Works ; Installer opens after a click on Update Device

Test 4.
attemptToFetchMajorUpgrade -> true
majorUpgradeAppPath is set not set
Installer is not present in Applications (Backuppath)
Update Defer 90 Days
Works; Nudge can not download Updates and exits.

Test 5.
attemptToFetchMajorUpgrade -> true
majorUpgradeAppPath is set not set
Installer is not present in Applications (Backuppath)
Update Defer 90 Days
Works; Nudge can not download Updates and exits.

Test 6.
attemptToFetchMajorUpgrade -> true
majorUpgradeAppPath is set not set
Installer is not present in Applications (Backuppath)
Update Defer 7 Days
Works; Nudge starts downloads the Update and starts

Test 7.
attemptToFetchMajorUpgrade -> true
majorUpgradeAppPath is set not set
Installer is present in Applications (Backuppath)
Update Defer 7 Days
Works; Nudge starts.