Remove orphan form title component

This removes the unused form title component and
its specs and snapshot.

app/assets/javascripts/vue_shared/components/form/title.vue

-<!-- eslint-disable vue/multi-word-component-names -->
-<script>
-import { GlFormInput, GlFormGroup } from '@gitlab/ui';
-
-export default {
-  components: {
-    GlFormInput,
-    GlFormGroup,
-  },
-  inheritAttrs: false,
-};
-</script>
-<template>
-  <gl-form-group :label="__('Title')" label-for="title-field-edit">
-    <gl-form-input v-bind="$attrs" v-on="$listeners" />
-  </gl-form-group>
-</template>

spec/frontend/vue_shared/components/form/__snapshots__/title_spec.js.snap

-// Jest Snapshot v1, https://goo.gl/fbAQLP
-
-exports[`Title edit field matches the snapshot 1`] = `
-<gl-form-group-stub
-  label="Title"
-  label-for="title-field-edit"
-  labeldescription=""
-  optionaltext="(optional)"
->
-  <gl-form-input-stub />
-</gl-form-group-stub>
-`;

spec/frontend/vue_shared/components/form/title_spec.js

-import { shallowMount } from '@vue/test-utils';
-import TitleField from '~/vue_shared/components/form/title.vue';
-
-describe('Title edit field', () => {
-  let wrapper;
-
-  function createComponent() {
-    wrapper = shallowMount(TitleField);
-  }
-
-  beforeEach(() => {
-    createComponent();
-  });
-
-  it('matches the snapshot', () => {
-    expect(wrapper.element).toMatchSnapshot();
-  });
-});