Fix LaMetric config flow for cloud import path

[frenck]

Proposed change

I received a newer (additional) LaMetric model, meaning I got to test the flow with having multiple LaMetric devices IRL, which uncovered two issues with this flow.

1. The translations didn't show (wrong step name in translations)
2. The discovered device (happening in the background) causes an already in-progress to be raised.

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• This PR fixes or closes issue: fixes #
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[home-assistant]

Hey there @robbiet480, @bachya, mind taking a look at this pull request as it has been labeled with an integration (lametric) you are listed as a code owner for? Thanks!

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[edenhaus]

Thanks @frenck 👍

[MartinHjelmare]

We're missing a test for the case where there's another flow in progress.

[frenck]

Will add one 👍