Globally set the default placeholder for select fields in DDF

[skateman]

Found by @himdel in #6698 (comment)

Before:

After:

[miq-bot]

Checked commit skateman@e9050b8 with ruby 2.5.7, rubocop 0.69.0, haml-lint 0.28.0, and yamllint
0 files checked, 0 offenses detected
Everything looks fine. 🏆

[simaishi]

@skateman Backporting to jansa conflicts. Please create a PR for jansa branch.

diff --cc app/javascript/forms/mappers/formsFieldsMapper.jsx
index d0073fc7f,d1490920b..000000000
--- a/app/javascript/forms/mappers/formsFieldsMapper.jsx
+++ b/app/javascript/forms/mappers/formsFieldsMapper.jsx
@@@ -1,6 -1,6 +1,11 @@@
  import React from 'react';
++<<<<<<< HEAD:app/javascript/forms/mappers/formsFieldsMapper.jsx
 +import { componentTypes } from '@data-driven-forms/react-form-renderer';
 +import { formFieldsMapper, components } from '@data-driven-forms/pf3-component-mapper';
++=======
+ import { formFieldsMapper, components } from '@data-driven-forms/pf3-component-mapper';
+ import { componentTypes } from '@@ddf';
++>>>>>>> 51f10875d... Merge pull request #7084 from skateman/ddf-select-placeholder:app/javascript/forms/mappers/formFieldsMapper.jsx

  import AsyncCredentials from '../../components/async-credentials/async-credentials';
  import AsyncProviderCredentials from '../../components/async-credentials/async-provider-credentials';
@@@ -22,7 -23,8 +27,12 @@@ const fieldsMapper =
    'password-field': PasswordField,
    'validate-credentials': AsyncCredentials,
    'validate-provider-credentials': AsyncProviderCredentials,
++<<<<<<< HEAD:app/javascript/forms/mappers/formsFieldsMapper.jsx
 +  [componentTypes.SELECT]: props => <components.SelectField classNamePrefix="miq-ddf-select" {...props} />,
++=======
+   'field-array': FieldArray,
+   [componentTypes.SELECT]: props => <components.SelectField placeholder={`<${__('Choose')}>`} {...props} />,
++>>>>>>> 51f10875d... Merge pull request #7084 from skateman/ddf-select-placeholder:app/javascript/forms/mappers/formFieldsMapper.jsx
  };

[simaishi]

Backported to jansa via #7089