branchcache: change the _delayed flag to an explicit `_dirty` flag This is more consistent with the logic we use for other object and it open the way to a clearer management of the cache state. Now, cache are created clean, cache update mark them dirty, writing them on disk mark them clean again.

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    "conduit_uri": "https://phab.mercurial-scm.org/api",

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    "phabricator.uri": "https://phab.mercurial-scm.org/",

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    "repository.callsign": "HG",

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    "arc.land.onto.default": "@",

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    "base": "hg:.^"

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