Yet more test migrations

[jesseduffield]

• PR Description

Migrates some more tests. Also adds some helper functions for interacting with popup panels e.g.:

before:

assert.InPrompt()
assert.CurrentViewTitle(Equals("Enter a file name"))
input.Type("my file")
input.Confirm()

assert.InMenu()
assert.CurrentViewTitle(Equals("Choose file content"))
assert.SelectedLine(Contains("foo"))
input.NextItem()
assert.SelectedLine(Contains("bar"))
input.Confirm()

assert.InConfirm()
assert.CurrentViewTitle(Equals("Are you sure?"))
input.Confirm()

after

input.Prompt(Equals("Enter a file name"), "my file")

input.Menu(Equals("Choose file content"), Contains("bar"))

input.AcceptConfirmation(Equals("Are you sure?"), Equals("Are you REALLY sure you want to make this file? Up to you buddy."))

I considered using named arguments via a struct but it's always so annoying having to instantiate the struct at the callsite, and vscode now supports viewing positional arg names inline so I think the position arg approach works.

• Please check if the PR fulfills these requirements

• Cheatsheets are up-to-date (run go run scripts/cheatsheet/main.go generate)
• Code has been formatted (see here)
• Tests have been added/updated (see here for the integration test guide)
• Text is internationalised (see here)
• Docs (specifically docs/Config.md) have been updated if necessary
• You've read through your own file changes for silly mistakes etc