Revert "Prefix secrets with DBT_ENV_SECRET_ for test env vars" #8327

Job	Run time
build packages	20s
code-quality	1m 20s
unit test / python 3.8	1m 42s
unit test / python 3.9	1m 40s
unit test / python 3.10	1m 7s
unit test / python 3.11	1m 5s
verify packages / python 3.8 / ubuntu-latest	33s
verify packages / python 3.9 / ubuntu-latest	41s
verify packages / python 3.10 / ubuntu-latest	37s
verify packages / python 3.11 / ubuntu-latest	36s
verify packages / python 3.8 / macos-12	1m 8s
verify packages / python 3.9 / macos-12	1m 12s
verify packages / python 3.10 / macos-12	1m 24s
verify packages / python 3.11 / macos-12	1m 14s
verify packages / python 3.8 / windows-latest	2m 17s
verify packages / python 3.9 / windows-latest	2m 11s
verify packages / python 3.10 / windows-latest	2m 11s
verify packages / python 3.11 / windows-latest	2m 12s
	23m 30s

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