The name of root collection inside the Akonadi DB (and thus, i.e. inside KMail)
is always akonadi_ews_resource#, even if the resource itself was renamed.
Even though we call mRootCollection->setName(name()), the name get's
overriden after we fetch it from DB.
The settings UI changes the name of the resource, but not root collection.
This patch runs CollectionModifyJob to rename the root collection in both
scenarios: either when we fetch root collection or change the resource name.
BUG: 413078
BUG: 416663