chore: add eslint rule for disabling createContext outside _singletons

[binoy14]

Description

Adds an eslint rule that complains about using createContext from react in structure, core or router

requires #6350

What to review

Linting passes

Notes for release

N/A

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[binoy14]

• chore: add eslint rule for disabling createContext outside _singletons #6349 👈
• refactor: move createContext instances to singletons #6285 : 2 other dependent PRs (#6286 , #6394 )
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[github-actions]

No changes to documentation

[github-actions]

Component Testing Report Updated Apr 29, 2024 2:36 PM (UTC)

File	Status	Duration	Passed	Skipped	Failed
comments/CommentInput.spec.tsx	✅ Passed (Inspect)	35s	15	0	0
formBuilder/ArrayInput.spec.tsx	✅ Passed (Inspect)	6s	3	0	0
formBuilder/inputs/PortableText/Annotations.spec.tsx	✅ Passed (Inspect)	25s	6	0	0
formBuilder/inputs/PortableText/copyPaste/CopyPaste.spec.tsx	✅ Passed (Inspect)	20s	6	3	0
formBuilder/inputs/PortableText/Decorators.spec.tsx	✅ Passed (Inspect)	13s	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	14	0	0
formBuilder/inputs/PortableText/ObjectBlock.spec.tsx	✅ Passed (Inspect)	1m 5s	18	0	0
formBuilder/inputs/PortableText/RangeDecoration.spec.tsx	✅ Passed (Inspect)	20s	9	0	0
formBuilder/inputs/PortableText/Styles.spec.tsx	✅ Passed (Inspect)	14s	6	0	0
formBuilder/inputs/PortableText/Toolbar.spec.tsx	❌ Failed (Inspect)	26s	8	0	1