Rename corpus_upload_modal to corpus_upload form

* Rename component, update specs

ee/app/assets/javascripts/security_configuration/corpus_management/components/corpus_upload.vue

 <script>
 import { GlButton, GlModal, GlModalDirective } from '@gitlab/ui';
-import CorpusUploadModal from 'ee/security_configuration/corpus_management/components/corpus_upload_modal.vue';
+import CorpusUploadForm from 'ee/security_configuration/corpus_management/components/corpus_upload_form.vue';
 import { numberToHumanSize } from '~/lib/utils/number_utils';
 import { s__ } from '~/locale';
 import addCorpusMutation from '../graphql/mutations/add_corpus.mutation.graphql';
@@ -11,7 +11,7 @@ export default {
   components: {
     GlButton,
     GlModal,
-    CorpusUploadModal,
+    CorpusUploadForm,
   },
   directives: {
     GlModalDirective,
@@ -107,7 +107,7 @@ export default {
       @primary="addCorpus"
       @canceled="resetCorpus"
     >
-      <corpus-upload-modal />
+      <corpus-upload-form />
     </gl-modal>
   </div>
 </template>

ee/spec/frontend/security_configuration/corpus_management/components/__snapshots__/corpus_upload_spec.js.snap

@@ -42,7 +42,7 @@ exports[`Corpus Upload component renders header 1`] = `
     title="New corpus"
     titletag="h4"
   >
-    <corpus-upload-modal-stub />
+    <corpus-upload-form-stub />
   </gl-modal-stub>
 </div>
 `;

ee/spec/frontend/security_configuration/corpus_management/components/corpus_upload_modal_spec.js → ee/spec/frontend/security_configuration/corpus_management/components/corpus_upload_form_spec.js

 import { createLocalVue, mount } from '@vue/test-utils';
 import VueApollo from 'vue-apollo';
-import CorpusUploadModal from 'ee/security_configuration/corpus_management/components/corpus_upload_modal.vue';
+import CorpusUploadForm from 'ee/security_configuration/corpus_management/components/corpus_upload_form.vue';
 import createMockApollo from 'helpers/mock_apollo_helper';
 import waitForPromises from 'helpers/wait_for_promises';
 
@@ -51,7 +51,7 @@ describe('Corpus upload modal', () => {
   }
 
   const createComponent = (resolverMock, options = {}) => {
-    wrapper = mount(CorpusUploadModal, {
+    wrapper = mount(CorpusUploadForm, {
       localVue,
       apolloProvider: createMockApolloProvider(resolverMock),
       provide: {