Add support error identifier to flycheck-phpstan.el #61

Job	Run time
build (ubuntu-latest, 26.3, false)	39s
build (ubuntu-latest, 27.2, false)	40s
build (ubuntu-latest, 28.2, false)	43s
build (ubuntu-latest, 29.3, false)	47s
build (macos-latest, 26.3, false)	1m 2s
build (macos-latest, 27.2, false)	1m 4s
build (macos-latest, 28.2, false)	1m 35s
build (macos-latest, 29.3, false)	3m 15s
build (windows-latest, 26.3, false)	1m 53s
build (windows-latest, 27.2, false)	1m 14s
build (windows-latest, 28.2, false)	1m 19s
build (windows-latest, 29.3, false)	1m 25s
build (ubuntu-latest, snapshot, true)	38s
build (macos-latest, snapshot, true)	1m 33s
build (windows-latest, snapshot, true)	47s
	18m 34s

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