Eventlet usages in all manila components: manila, manila-ui and python-manilaclient must be removed. This includes tracking transitional dependencies to oslo components used in manila

Need to add more specific goals and considerations, questions

1. upstream steps/targets
2. downstream epics for testing, backports

Questions:

• do we capture all upstream/downstream here - or seperate epics, see what works best
• if we need CI teams - we will need an EPIC for them for final relases
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