Multi-account containers show also (deleted) temporary containers

[nekromoff]

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When using both Context Plus and Temporary containers https://addons.mozilla.org/en-US/firefox/addon/temporary-containers/

this happens:

Long gone (deleted) temp containers still show around in Context Plus UI.

Mentioned here, but invalid as it stems from Context Plus and not the original container functionality: https://bugzilla.mozilla.org/show_bug.cgi?id=1744937