Add import history table and import source table components

..._shared/components/import/import_history_table.stories.js

...pts/vue_shared/components/import/import_history_table.vue

...vue_shared/components/import/import_history_table_row.vue

...ts/import/import_history_table_row_destination.stories.js

...ponents/import/import_history_table_row_errors.stories.js

...mponents/import/import_history_table_row_stats.stories.js

...ared/components/import/import_history_table_row_stats.vue

.../components/import/import_history_table_source.stories.js

...red/components/import/import_source_list_table.stories.js

...vue_shared/components/import/import_source_list_table.vue

locale/gitlab.pot

...rontend/vue_shared/components/import/history_mock_data.js

...vue_shared/components/import/import_history_table.spec.js

...components/import/import_history_table_row_errors.spec.js

.../components/import/import_history_table_row_stats.spec.js

...shared/components/import/import_source_list_table.spec.js

...end/vue_shared/components/import/source_list_mock_data.js

spec/frontend/vue_shared/components/import/utils.js