refactor: add a BC layer for 2.x #1990

Job	Run time
Code Coverage	1m 10s
Build Documentation	13s
Static Analysis	29s
P:8.1, S:6.3.*, D:mysql (dama)	42s
P:8.1, S:6.3.*, D:mongo	50s
Sync meta files	0s
P:8.1, S:6.4.*, D:mysql (dama)	34s
P:8.1, S:6.4.*, D:mongo	53s
P:8.2, S:6.3.*, D:mysql (dama)	40s
P:8.2, S:6.3.*, D:mongo	37s
P:8.2, S:6.4.*, D:mysql (dama)	34s
P:8.2, S:6.4.*, D:mongo	38s
P:8, S:5.4.*, D:mysql\|mongo (lowest) (dama)	45s
P:8.2, S:*, D:none	17s
P:8.2, S:*, D:mysql\|mongo (dama)	56s
P:8.2, S:*, D:pgsql\|mongo (dama)	1m 3s
P:8.2, S:*, D:pgsql	1m 54s
composer-validate / Validate composer.json	9s
Run php-cs-fixer	0s
	12m 24s

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