This reverts commit 129b6d00.

CI runs perfectly with 10 workflow threads and a
"check for work" interval of 1 second.

For now: puts a message in the log, does nothing and returns success.

RdbmsCatalogue::checkAndGetNextArchiveFileId() now calls getCachedRequesterMountPolicy() and getCachedRequesterGroupMountPolicy()

RdbmsCatalogue::getRequesterGroupMountPolicy() now returns optional<common::dataStructures::MountPolicy>

RdbmsCatalogue::getRequesterGroupMountPolicy() now returns std::unique_ptr<> instead of a raw pointer

Replaced calls to RdbmsCatalogue::getExpectedNbArchiveRoutes() with getCachedExpectedNbArchiveRoutes()