xfs: maintainer transition for 6.6 [v3]

I do not choose to continue as maintainer.

My final act as maintainer is to write down every thing that I've been
doing as maintainer for the past six years.  There are too many demands
placed on the maintainer, and the only way to fix this is to delegate
the responsibilities.  I also wrote down my impressions of the unwritten
rules about how to contribute to XFS.

The patchset concludes with my nomination for a new release manager to
keep things running in the interim.  Testing and triage; community
management; and LTS maintenance are all open positions.

I'm /continuing/ as a senior developer and reviewer for XFS.  I expect
to continue participating in interlock calls, LSFMM, etc.

v2: clarify release manager role, amend some factual errors, add some
    acks and reviews.
v3: add more review tags.

With a bit of luck, this should all go splendidly.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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