pds: Some PDS operations may have unexpected behavior

[zFernand0]

When checking for whether a data set is a PDS, we should consider changing the checks to a startsWith("PO") to make sure we cover PO-E, PO-L, PO-U, (and others?), and to avoid typos 🙏

zowe-cli/packages/zosfiles/src/methods/copy/Copy.ts

Line 204 in 14986b1

if((targetDataSetObj.dsorg == "PO" || targetDataSetObj.dsorg == "POE") && targetMember == undefined)

[github-actions]

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