Add tests and documentation for `parsing_configuration` #12732

Job	Run time
go mod download	41s
markdown-lint	20s
misspell	36s
go build	1m 58s
import-lint	34s
go test	12m 32s
go generate	5m 22s
terraform providers schema	31s
Sweeper Functions Not Linked	3m 33s
tfproviderdocs	10m 44s
	36m 51s

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