fix(ui): keep compiling when the design system adds an avatar size

[renefloor]

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Linear: FLU-797

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Description of the pull request

Three switches over StreamAvatarSize and StreamAvatarGroupSize were exhaustive, so adding a size to stream_core_flutter stopped this package compiling — which is what StreamAvatarSize.xxxl (104px) did, in GetStream/stream-core-flutter#189. They fall back to the largest size they know instead, and xxxl is mapped explicitly alongside the rest.

Losing exhaustiveness loses the compiler's nudge that a new size needs placing, so a test takes it over: it walks the enum's values against the expected mapping and fails on one the table has no entry for. This package resolves stream_core_flutter fresh on every CI run, so that lands as a red test rather than as an avatar quietly drawn at the wrong size.

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