Add reasonAttributes to MergeExpensesSkeleton usage sites #83405

Problem

As part of #81683, we need to add reasonAttributes to all skeleton components so that Sentry spans carry structured metadata about why a loading indicator is visible. This helps engineers debug infinite skeleton loading states.

Solution

Add reasonAttributes to all usage sites of MergeExpensesSkeleton (src/components/Skeletons/MergeExpensesSkeleton.tsx).

At each usage site:

1. Pass a reasonAttributes prop with a context string identifying the parent component (e.g. 'ParentComponent.ChildComponent')
2. Include relevant boolean state variables that determine the loading state (e.g. isLoading, isDataReady)

Example

const reasonAttributes: SkeletonSpanReasonAttributes = {
    context: 'ParentComponent',
    isLoading,
    isDataReady,
};

<MergeExpensesSkeleton reasonAttributes={reasonAttributes} />

Reference

• See PR #82927 as an example of how this was done for ActivityIndicator in image-loading contexts
• Parent issue: Track loading state conditions in Sentry spans to debug infinite skeletons #81683

Scope

• Component path: src/components/Skeletons/MergeExpensesSkeleton.tsx
• Usage sites to update: ~1 file