[13.x] Test Improvements

[hafezdivandari]

• Related to [13.x] Add an optional migration for oauth_clients table to the upgrade guide #1843 (comment)
  • Fix the upgrade guide code, since calling after modifier is not supported on nullableMorphs.
• Related to [13.x] Add an option to disable device code grant #1842
  • Check if Device code grant is enabled before prompting the user on passport:client Artisan command.
• Test Improvements
  • Tests are intermittently failing because the expire time is being rounded to 31,535,999 instead of 31,536,000.

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