PE-6655: assign existing name and undername to new manifest

[thiagocarvalhodev]

• assign an existing name to a manifest after a successful upload
• implement completer to wait ongoing calls to fetch ant records
• implement more tests
• general UI stuff for manifest fortm

--- Releases --- Android release: https://appdistribution.firebase.google.com/testerapps/1:305132849030:android:6cf0cd5ec064fad3ffce07/releases/7l1lp1b7cma4g

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit 6d8f56b):

https://ardrive-web--pr1829-pe-6655-assign-exist-uuc9tz5w.web.app

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