Update the code for logic of USE_TESTENV_PROPERTIES

[julian55455]

Related #3337

cc @ShelleyLambert

[smlambert]

Thanks @julian55455 - You can go one step further, since the if statements are now all the same, you will only need 1 of them. Leaving Line439 as it is, removing L443, L445, L449, L451.

Leaving a block that looks like this:

		if(!params.USE_TESTENV_PROPERTIES){
			String[] adoptSystemTest = getGitRepoBranch(params.ADOPTOPENJDK_SYSTEMTEST_OWNER_BRANCH, "adoptium:master", "aqa-systemtest")
			env.ADOPTOPENJDK_SYSTEMTEST_REPO = adoptSystemTest[0]
			env.ADOPTOPENJDK_SYSTEMTEST_BRANCH = adoptSystemTest[1]

			String[] openj9SystemTest = getGitRepoBranch(params.OPENJ9_SYSTEMTEST_OWNER_BRANCH, "eclipse:master", "openj9-systemtest")
			env.OPENJ9_SYSTEMTEST_REPO = openj9SystemTest[0]
			env.OPENJ9_SYSTEMTEST_BRANCH = openj9SystemTest[1]

			String[] stf = getGitRepoBranch(params.STF_OWNER_BRANCH, "adoptium:master", "STF")
			env.STF_REPO = stf[0]
			env.STF_BRANCH = stf[1]
		}

[smlambert]

Grinder (test job using the PR branch):
xLinux, hs, jdk11: https://ci.adoptopenjdk.net/view/Test_grinder/job/Grinder/5767

[sophia-guo]

There are two more places are using logic if(!params.USE_TESTENV_PROPERTIES) to doing setup. https://github.com/adoptium/aqa-tests/blob/master/buildenv/jenkins/JenkinsfileBase#L41 and https://github.com/adoptium/aqa-tests/blob/master/buildenv/jenkins/JenkinsfileBase#L427. #3337 mentioned to combine all those logic to one place https://github.com/adoptium/aqa-tests/blob/master/buildenv/jenkins/JenkinsfileBase#L41 .

It's fine to do it in two steps. First is this PR, @julian55455 I've updated your PR description to be related with #3337 instead of fix.