fix(schedule-publishing): update flag used to check scheduledPublishing

[pedrobonamin]

Description

The flag used to check the availability of scheduled publishing is incorrect, it should check scheduledPublishing, not sanityTasks

What to review

Testing

Notes for release

Fixes an issue in which users were incorrectly seeing the schedule publishing upsell ui.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
performance-studio	✅ Ready (Inspect)	Visit Preview		May 2, 2024 1:13pm
test-next-studio	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 2, 2024 1:13pm
test-studio	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 2, 2024 1:13pm

1 Ignored Deployment

Name	Status	Preview	Comments	Updated (UTC)
studio-workshop	⬜️ Ignored (Inspect)			May 2, 2024 1:13pm

[github-actions]

No changes to documentation

[github-actions]

Component Testing Report Updated May 2, 2024 1:18 PM (UTC)

File	Status	Duration	Passed	Skipped	Failed
comments/CommentInput.spec.tsx	✅ Passed (Inspect)	41s	15	0	0
formBuilder/ArrayInput.spec.tsx	✅ Passed (Inspect)	6s	3	0	0
formBuilder/inputs/PortableText/Annotations.spec.tsx	✅ Passed (Inspect)	26s	6	0	0
formBuilder/inputs/PortableText/copyPaste/CopyPaste.spec.tsx	✅ Passed (Inspect)	20s	6	3	0
formBuilder/inputs/PortableText/Decorators.spec.tsx	✅ Passed (Inspect)	14s	6	0	0
formBuilder/inputs/PortableText/FocusTracking.spec.tsx	✅ Passed (Inspect)	36s	15	0	0
formBuilder/inputs/PortableText/Input.spec.tsx	✅ Passed (Inspect)	1m 6s	15	0	0
formBuilder/inputs/PortableText/ObjectBlock.spec.tsx	✅ Passed (Inspect)	1m 4s	18	0	0
formBuilder/inputs/PortableText/RangeDecoration.spec.tsx	✅ Passed (Inspect)	21s	9	0	0
formBuilder/inputs/PortableText/Styles.spec.tsx	✅ Passed (Inspect)	14s	6	0	0
formBuilder/inputs/PortableText/Toolbar.spec.tsx	✅ Passed (Inspect)	22s	9	0	0

[jordanl17]

LGTM