[Bugfix] Better handling of unapproved grants in Grants Explorer

[JacobHomanics]

Fixes: #3717

Description

The previous implementation was stuck in a loading state when a grant was unapproved leading to confusion. Now, it will properly display a message to the user if the grant is in an unapproved state.

Checklist

This PR:

• Does it add new payout or donation token? In this case, have they been added to the indexer to avoid it to crash?
• Includes only changes relevant to the original ticket. Significant refactoring needs to be separated.
• Doesn't disable eslint rules.
• Doesn't work around the type checker (including but not limited to: type casts, non-null assertions, @ts-ignore, unjustified optional values).
• Doesn't contain commented out code.
• If adding/updating a feature, it adds/updates its test script on Notion.

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Name	Status	Preview	Comments	Updated (UTC)
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[MasterHW]

small but real QoL enhancement - lgtm!