[WIP] Show dedicated error when trying to pull tokens but we cannot parse

[Copilot]

Thanks for assigning this issue to me. I'm starting to work on it and will keep this PR's description up to date as I form a plan and make progress.

Original issue description:

If we have an error trying to parse tokens when pulling, we currently show a generic error "Failing to sync tokens, check credentials". Let's show the actual error that we encountered, instead of making the user guess what it is.

Fixes #3384.

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Latest commit: 763276d92ac04be5715a36f1fc308cb3165ee089

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[six7]

try again

[six7]

try again

[six7]

@copilot try again