Build

Adds ExtendableDashboard attribute to fix route name duplication when extending a DashboardController #2217

Job	Run time
linter	38s
phpstan	29s
phpunit (macos-latest, 8.4, 7.2, stable)	1m 21s
phpunit (windows-latest, 8.4, 7.2, stable)	1m 33s
phpunit (macos-latest, 8.4, 6.4, stable)	1m 23s
phpunit (windows-latest, 8.4, 6.4, stable)	1m 30s
phpunit (ubuntu-latest, 8.1, --prefer-lowest, stable)	27s
phpunit (ubuntu-latest, 8.1, 5.4, stable)	28s
phpunit (ubuntu-latest, 8.2, 6.4, stable)	39s
phpunit (ubuntu-latest, 8.3, 7.1, stable)	29s
phpunit (ubuntu-latest, 8.4, 7.1, stable)	25s
phpunit (ubuntu-latest, 8.4, 7.2, stable)	39s
	10m 1s

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