feat: change node url for proposal

[MarkNerdi996]

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[maxwellmattryan]

Have one requested change with some feedback:

• When I change the node URL, it isn't reactive in the ProposalInformationPane

[maxwellmattryan]

I didn't notice this the last time I tested this PR, but we should adjust the locales when editing a proposal to something like "Successfully edited proposal" instead of "Proposal successfully added"

[maxwellmattryan]

Code LGTM! Just have one last thing we should do before merging in 🙏

[nicole-obrien]

Dropdown is hidden on the popup

[nicole-obrien]

LGTM!

stale