Encoding not honored for spool files

[VitGottwald]

Describe the bug

When I specify encoding in my z/OSMF profile it is honored for dataset retrieval/upload but not for spool file retrieval.

This is most likely because the following call does not take encoding into account

zowe-explorer-vscode/packages/zowe-explorer/src/trees/job/JobActions.ts

Line 177 in b43eccb

await ZoweExplorerApiRegister.getJesApi(job.getProfile()).downloadSpoolContent({

To Reproduce

1. Set encoding in zosmf profle to ibm278
2. Create a PDS member containing a nordic national character like Ö
3. Print it to spool - e.g. via IEBGENER
4. Open the PDS member and see Ö
5. Open the spool file and see @

Expected behavior
Encoding from zosmf profile is honored both for dataset and spool operations.

[github-actions]

Thank you for creating a bug report.
We will investigate the bug and evaluate its impact on the product.
If you haven't already, please ensure you have provided steps to reproduce the bug and as much context as possible.

[VitGottwald]

The situation that I ran into this was when looking at a listing of a COBOL program that uses a nordic encoding.

[JTonda]

Closing in favor of #1941