fix: remove textarea for image alt

[edmonday]

Description

Issue

Textarea was still being used when not needed.

Solution

• Removed Textarea
• Removed UpdateableField
• Added ImageAlt component

[linear[bot]]

ENG-1451 remove Textarea component -no qa

[github-actions[bot]]

	Warnings
:warning:	:exclamation: Big PR (621 changes)

(change count - 621): Pull Request size seems relatively large. If Pull Request contains multiple changes, split each into separate PR will helps faster, easier review.

Generated by :no_entry_sign: dangerJS against 63e2e6e308d7433916eee3829777d5d129f4cac3

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