Provide a migration for people using „sites“ and rewrite this to Neos.Neos:Sites?

[mhsdesign]

We should provide a migration for people using „sites“ and rewrite this to Neos.Neos:Sites

Originally posted by @mhsdesign in neos/neos-development-collection#4339 (comment)

to be discussed in which places this should happen.

most obvious ones are in yaml configurations fx for startingPoints of the reference editor.

i think transforming php automagically might not be trivial, so I would count on manual migration there, but we should still highlight possible places with todo comments

[dlubitz]

@mhsdesign Can we somehow make this more specific?

[mhsdesign]

Hmm maybe this is unmigrateable as nodePaths are discouraged, so everyone using them should revisit this code either way.

old:

/sites/my-site-node/bla

new:

/<Neos.Neos:Sites>/my-site-node/bla