feat: adding visually hidden text to button for screen readers

[Ibabalola]

As per a GDS accessbility requirement

    <button
      onClick={handleClick}
      disabled={disable}
      type={type}
      aria-label={ariaLabel}
      formAction={formAction}
      name={name}
      className={btnClassName}
      value={value}
      {...props}
    >
      {prefix}
      {isLoading && loadingLabel ? loadingLabel : label}
      {visuallyHiddenText && (
        <span className={visuallyHiddenText.className}>
          {visuallyHiddenText.text}
        </span>
      )}
      {!isLoading && children}
      {postfix}
    </button>

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (b90acfd) to head (8d4de4b).

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## release/1.0.0 #653 +/- ## =============================================== Coverage 100.00% 100.00% =============================================== Files 85 85 Lines 1543 1545 +2 Branches 535 537 +2 =============================================== + Hits 1543 1545 +2 ```

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