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How can I add the same CSS class (form__text) to form elements in Drupal 8?

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You can do it using template_preprocess_form_element something like:

use Drupal\Component\Utility\Html;
function [YOURTHEME]_preprocess_form_element(&$variables) {
  $input_types = ['search', 'textfield', 'password'];
  $type = $variables['element']['#type'] ?? NULL;
  if (in_array($type, $input_types)) {
    $variables['element']['#attributes']['class'][] = Html::cleanCssIdentifier('form__text');
  }
}

Update If the below doesn’t work try the following using hook_preprocess:

/**
 * Implements hook_preprocess().
 */
function [YOURTHEME]_preprocess(&$variables, $hook) {
  if ($hook == 'input') {
    $variables['attributes']['class'][] = Html::cleanCssIdentifier('form__text');
  }
}

To exclude submit button ?
change the condition to $hook == 'input' && $variables['element']['#type'] !== 'submit' instead of $hook == 'input'

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