HPCC-30525 Fix issues of cased dropzone names mismatching group name

[jakesmith]

Group names have always been treated as case-insensitive. Since 9.2 (HPCC-29553) groups have been created to match dropzones. This PR ensures that groups names created by dropzones are lowercased.

This bug was causing environments with non-lowercased dropzone names to cause failures during sprays of the form: "DFUServer Error Failed: DFUWU: Logical group not found"

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[github-actions]

https://track.hpccsystems.com/browse/HPCC-30525
Jira updated

[wangkx]

@jakesmith looks fine in constructGroup(). One question: I found similar function in ensureConsistentStorageGroup(). Could it be used for dropzone group?

[jakesmith]

@jakesmith looks fine in constructGroup(). One question: I found similar function in ensureConsistentStorageGroup(). Could it be used for dropzone group?

That is used when creating grops from plans storage, so slightly different, but yes, there is a potential casing issue there I think, if the planes had mixed casing names.
I'll add a fix there at same time, just in case.

[jakesmith]

@ghalliday @wangkx - please see new commit.

[ghalliday]

@jakesmith please squash and I will merge.

[jakesmith]

@jakesmith please squash and I will merge.

@ghalliday squashed.