Fix ContentScopeControls groupBy fallback for scopes with different shapes

[VPS-thodax]

Problem

ContentScopeControls derives its groupBy fallback from the currently selected scope's own keys (Object.keys(scope)[0]). When the available scopes have different shapes (e.g. { domain: "main" } and { company: "123" }), this can pick a dimension that not every scope has, breaking the scope switcher on scope change.

Cause

The fallback only looks at the single currently-active scope, not at the full set of available scopes (values), so it has no way to know whether the picked dimension is actually safe to group by across all of them.

Fix

The fallback now inspects all available scopes and only picks a groupBy dimension when every scope shares the exact same set of dimensions; otherwise no default is applied and the list stays ungrouped. ContentScopeSelect's hasMultipleDimensions check is also tightened to require every option to have more than one dimension before grouping is attempted, so a mix of shapes is never grouped by a dimension some option lacks.

Verification

Added unit tests in Controls.test.tsx covering both cases:

• scopes with different shapes render without grouping or crashing
• scopes with a uniform shape still group correctly by the shared dimension

Further information

• Task: https://vivid-planet.atlassian.net/browse/COM-1561

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