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nodemap: deal with the "debugupdatecache" case using a "fake" transaction

Authored by marmoute.

Description

nodemap: deal with the "debugupdatecache" case using a "fake" transaction

We are going to need more and more methods of the transaction. So lets change
approach. The hg debugupdatecache case do not need a transaction, because has
the repositories locked, but is not adding any "store" data to it.

Differential Revision: https://phab.mercurial-scm.org/D8186