Transfer PDS_STORAGE variables to prepare wrapper application

[lorriborri]

Situaton

The prepare wrapper application needs access to variables defined in PDSStorageConstants because it needs access to the shared storage to upload remote data.

Wanted

PDSExecutionCallable should put the PDS_STORAGE variables as environment variables to the process builder, but only when PREPARE is the Scantype

Solution

Implement a component that only hosts the PDS_STORAGE variables and has a function createStorageMap to create a map of all PDS_STORAGE variables. The PDSExecutionEnvironmentService should autowire the component and call the createStorageMap function and add the PDS_STORAGE variables to the return map, when the ScanType is PREPARE.

[de-jcup]

When I created and implemented #3142 I had the idea to handle it different for scan type PREPARE. But I decided to NOT do this.

Main reasons were:

• avoid magic for special scan types, treat every scan type as same citizen...
• be future ready. if we need any other special env variable at runtime for a PDS solution, we just enter it again
• The script processes shall not have access to other environment variables than necessary.
• It shall be clear which environment variables are accessible by script and it shall be configurable

3142 is already implemented and merged to develop branch and works.

IMO we should close this issue.