Remove duplicate packaging test scripts

Author: mark-vieira

.ci/jobs.t/elastic+elasticsearch+multijob+packaging-tests-unix.yml

@@ -40,4 +40,4 @@
             RUNTIME_JAVA_HOME=$HOME/.java/$ES_RUNTIME_JAVA
       - shell: |
           #!/usr/local/bin/runbld --redirect-stderr
-          ./.ci/os.sh --build-cache -Dorg.elasticsearch.build.cache.url=https://gradle-enterprise.elastic.co/cache/ destructivePackagingTest
+          ./.ci/scripts/packaging-test.sh --build-cache -Dorg.elasticsearch.build.cache.url=https://gradle-enterprise.elastic.co/cache/ destructivePackagingTest

.ci/jobs.t/elastic+elasticsearch+multijob+packaging-tests-upgrade.yml

@@ -29,4 +29,4 @@
             JAVA16_HOME=$HOME/.java/openjdk16
       - shell: |
           #!/usr/local/bin/runbld --redirect-stderr
-          ./.ci/os.sh --build-cache -Dorg.elasticsearch.build.cache.url=https://gradle-enterprise.elastic.co/cache/ -Dbwc.checkout.align=true destructiveDistroUpgradeTest.v$BWC_VERSION
+          ./.ci/scripts/packaging-test.sh --build-cache -Dorg.elasticsearch.build.cache.url=https://gradle-enterprise.elastic.co/cache/ -Dbwc.checkout.align=true destructiveDistroUpgradeTest.v$BWC_VERSION

.ci/os.ps1

@@ -10,7 +10,6 @@ If (-NOT ([Security.Principal.WindowsPrincipal] [Security.Principal.WindowsIdent
 $AppProps = ConvertFrom-StringData (Get-Content .ci/java-versions.properties -raw)
 $env:ES_BUILD_JAVA=$AppProps.ES_BUILD_JAVA
 $env:ES_RUNTIME_JAVA=$AppProps.ES_RUNTIME_JAVA
-$env:JAVA_TOOL_OPTIONS=''
 
 $ErrorActionPreference="Stop"
 $gradleInit = "C:\Users\$env:username\.gradle\init.d\"