fix(developer): create Server config directory before options save 🍒 🏠

[mcdurdin]

Also use back-off logic for saving in case config file is locked by another process.

Cherry-pick-of: #12608 Fixes: #12607 Fixes: KEYMAN-DEVELOPER-1Z1

@keymanapp-test-bot skip

[keymanapp-test-bot[bot]]

User Test Results

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• Developer
  • Keyman Developer
  • Compiler Regression Tests
  • kmcomp.zip
• Keyboards
  • Test Keyboards

[keyman-server]

Changes in this pull request will be available for download in Keyman version 17.0.332