refactor(web-react): extract HelperText and move useAriaIds to shared hooks

[crishpeen]

Description

Extract HelperText into its own component and move useAriaIds to shared hooks.

• HelperText: Moved from Field to standalone HelperText component with its own folder (stories, demo, figma, tests, README). Uses PropsContext for isDisabled and formFieldVariant; prop priority is direct props > context > defaultProps. Introduced FormFieldVariants constant (BOX, INLINE, ITEM) and use it everywhere instead of string literals.
• useAriaIds: Moved from components/Field/useAriaIds.tsx to hooks/useAriaIds.ts; re-exported from Field for backward compatibility. Tests moved to hooks/__tests__/useAriaIds.test.tsx and expanded.
• Form field context: All relevant components (TextFieldBase, Select, Toggle, Slider, FieldGroup, FileUploaderInput, Item, Checkbox, Radio, UNSTABLE_FileUpload) provide PropsProvider with isDisabled and formFieldVariant so HelperText (and later ValidationText) receive correct styling.

Additional context

• Breaking: HelperText is no longer exported from Field; import from HelperText or the package root.
• Review prop priority tests in HelperText.test.tsx and useAriaIds tests in hooks/__tests__/useAriaIds.test.tsx.

Issue reference

https://jira.almacareer.tech/browse/DS-2398

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[crishpeen]

Update the demo to match the web!

[dlouhak]

Could you please take a look on this custom form field components? It's not valid due to extractions.

spirit-design-system/packages/web-react/src/components/Select/README.md

Line 94 in 7ed66db

{helperText && <div className={classProps.helperText}>{helperText}</div>}

(also in Checkbox, Radio)

[crishpeen]

fixed comments in #2547, closing this in its favour