feat(dashboard): manage inventory placeholder

[fPolic]

What

• add placeholder on variant details when inventor is not managed

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CLOSES CC-127

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Name	Status	Preview	Comments	Updated (UTC)
medusa-dashboard	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 19, 2024 8:37am

6 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
api-reference	⬜️ Ignored (Inspect)			Sep 19, 2024 8:37am
api-reference-v2	⬜️ Ignored (Inspect)			Sep 19, 2024 8:37am
docs-ui	⬜️ Ignored (Inspect)			Sep 19, 2024 8:37am
docs-v2	⬜️ Ignored (Inspect)			Sep 19, 2024 8:37am
medusa-docs	⬜️ Ignored (Inspect)			Sep 19, 2024 8:37am
resources-docs	⬜️ Ignored (Inspect)			Sep 19, 2024 8:37am

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Latest commit: d2968da

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