fix(2.x): restore PHPUnit error handler #2272

Job	Run time
Build Documentation	25s
P:8.1, S:6.4.*, D:mysql (dama) (schema)	30s
Code Coverage	1m 20s
P:8.1, S:6.4.*, D:mongo (schema)	47s
Static Analysis	19s
Sync meta files	0s
P:8.2, S:6.4.*, D:mysql (dama) (schema)	50s
P:8.2, S:6.4.*, D:mongo (schema)	38s
P:8.2, S:7.0.*, D:mysql (dama) (schema)	31s
P:8.2, S:7.0.*, D:mongo (schema)	43s
P:8.3, S:6.4.*, D:mysql (dama) (schema)	31s
P:8.3, S:6.4.*, D:mongo (schema)	31s
P:8.3, S:7.0.*, D:mysql (dama) (schema)	30s
P:8.3, S:7.0.*, D:mongo (schema)	40s
P:8.3, S:*, D:none (schema)	17s
P:8.3, S:*, D:mysql\|mongo (dama) (schema)	56s
P:8.3, S:*, D:pgsql\|mongo (dama) (schema)	1m 6s
P:8.3, S:*, D:pgsql (schema)	1m 7s
P:8.3, S:*, D:sqlite (schema)	48s
P:8.3, S:*, D:sqlite (lowest) (schema)	46s
P:8.3, S:*, D:mysql (lowest) (dama) (schema)	34s
composer-validate / Validate composer.json	11s
P:8.3, S:*, D:mysql (dama) (migrate)	35s
Run php-cs-fixer	0s
	14m 35s

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