refactor: add a BC layer for 2.x #2056

Job	Run time
Build Documentation	18s
Code Coverage	1m 5s
Static Analysis	33s
Sync meta files	0s
Test rector rules	11s
P:8.1, S:6.3.*, D:mysql (dama)	33s
P:8.1, S:6.3.*, D:mongo	40s
P:8.1, S:6.4.*, D:mysql (dama)	51s
P:8.1, S:6.4.*, D:mongo	45s
P:8.2, S:6.3.*, D:mysql (dama)	47s
P:8.2, S:6.3.*, D:mongo	43s
P:8.2, S:6.4.*, D:mysql (dama)	45s
P:8.2, S:6.4.*, D:mongo	43s
P:8.2, S:7.0.*, D:mysql (dama)	35s
P:8.2, S:7.0.*, D:mongo	40s
P:8, S:5.4.*, D:mysql\|mongo (lowest) (dama)	2m 39s
P:8.2, S:*, D:none	26s
P:8.2, S:*, D:mysql\|mongo (dama)	1m 3s
P:8.2, S:*, D:pgsql\|mongo (dama)	1m 14s
composer-validate / Validate composer.json	7s
P:8.2, S:*, D:pgsql	2m 8s
Run php-cs-fixer	0s
	16m 46s

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