(PE-39789) Support custom environment #891

Job	Run time
Spec / Setup Test Matrix	16s
Spec / Spec tests (Puppet: ~> 8.0, Ruby Ver: 3.2)	41s
Acceptance / Setup Test Matrix	12s
Acceptance / Acceptance tests (AlmaLinux-9, puppetcore8)	1m 42s
Acceptance / Acceptance tests (RedHat-7, puppetcore8)	10m 11s
Acceptance / Acceptance tests (RedHat-9, puppetcore8)	10m 11s
Acceptance / Acceptance tests (CentOS-9, puppetcore8)	1m 10s
Acceptance / Acceptance tests (AlmaLinux-8, puppetcore8)	1m 52s
Acceptance / Acceptance tests (RedHat-9-arm, puppetcore8)	9m 56s
Acceptance / Acceptance tests (RedHat-8, puppetcore8)	15m 50s
Acceptance / Acceptance tests (Ubuntu-22.04, puppetcore8)	1m 46s
Acceptance / Acceptance tests (Ubuntu-22.04-arm, puppetcore8)	10m 39s
Acceptance / Acceptance tests (Ubuntu-20.04, puppetcore8)	1m 41s
Acceptance / Acceptance tests (Ubuntu-18.04, puppetcore8)	1m 46s
Acceptance / Acceptance tests (Ubuntu-24.04, puppetcore8)	1m 43s
Acceptance / Acceptance tests (Ubuntu-24.04-arm, puppetcore8)	5m 46s
Acceptance / Acceptance tests (SLES-12, puppetcore8)	10m 29s
	1h 25m 51s

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