PerResourceLocalChangeFetcher gives back incorrect total changes to be uploaded

[MJ1998]

Describe the bug When we use PerResourceLocalChangeFetcher combined with PerResourcePatchGenerator (in Uploader) we basically squash all the local changes per resource before uploading. So we can say there will as many upload requests as many unique resources in the LocalChange database. Hence the total requests in SyncUploadProgress should not fetch count of all the local change records but rather count of unique resources in LocalChange.

Component Core library, SDC library, reference app, or SDC gallery app

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