Add the missing support of help texts to InputGroup (#663)

[adamkudrna]

InputGroup now supports the helpTexts prop.

For FileInputField, Select, and TextField, help text is not rendered within the InputGroup context. The helpTexts prop of InputGroup must be used instead.

Closes #663.

[Copilot]

Pull Request Overview

This PR adds support for help texts to the InputGroup component, allowing developers to provide additional guidance for grouped inputs. Previously, InputGroup only supported validation texts.

Key changes:

• Added helpTexts prop to InputGroup for displaying help messages
• Modified TextField, SelectField, and FileInputField to suppress their individual help texts when used within an InputGroup
• Updated documentation and tests to reflect the new functionality

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/components/InputGroup/InputGroup.jsx	Added helpTexts prop and rendering logic for help text list
src/components/InputGroup/InputGroup.module.scss	Added .helpText class selector to styling rules
src/components/TextField/TextField.jsx	Prevented help text rendering within InputGroup context and updated documentation
src/components/SelectField/SelectField.jsx	Prevented help text rendering within InputGroup context and updated documentation
src/components/FileInputField/FileInputField.jsx	Prevented help text and validation text rendering within InputGroup context and updated documentation
src/components/InputGroup/tests/InputGroup.spec.tsx	Added test coverage for help texts functionality
src/components/InputGroup/README.md	Added documentation section for help texts feature with examples
src/components/Button/README.md	Fixed spelling error in documentation

Comments suppressed due to low confidence (2)

src/components/TextField/TextField.jsx:1

• The documentation incorrectly refers to 'help text' when it should say 'validation text'. This comment is describing the validationText prop behavior, not the helpText prop.

import PropTypes from 'prop-types';

src/components/SelectField/SelectField.jsx:1

• The documentation incorrectly refers to 'help text' when it should say 'validation text'. This comment is describing the validationText prop behavior, not the helpText prop.

import PropTypes from 'prop-types';

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