refactor(tile): use relative paths for imports in the same pkg (#12103)

### Related Ticket(s)

[ADCMS-6691](https://jsw.ibm.com/browse/ADCMS-6691)
Follow up to #12091

### Description

Quick followup to #12091. Updates imports for the same package to be relative paths. Can avoid weird local development / bundling bugs and maintains consistency with the rest of the codebase.

### Changelog

**Changed**

- Adjusts `import '@carbon/ibmdotcom-web-components/es*';` imports to relative path imports.

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packages/web-components/src/components/tile/__stories__/tile-group.stories.ts

@@ -10,7 +10,7 @@
 import { html } from 'lit';
 import '../index';
 import readme from './README--tile-group.stories.mdx';
-import '@carbon/ibmdotcom-web-components/es/components/image';
+import '../../image';
 import {
   Default as DefaultTile,
   WithImage as TileWithImage,

packages/web-components/src/components/tile/__stories__/tile.stories.ts

@@ -11,8 +11,8 @@ import { html } from 'lit';
 import '@carbon/web-components/es/components/tag/tag';
 import '../index';
 import readme from './README--tile.stories.mdx';
-import '@carbon/ibmdotcom-web-components/es/components/cta/video-cta-container';
-import '@carbon/ibmdotcom-web-components/es/components/image';
+import '../../cta/video-cta-container';
+import '../../image';
 
 import { CTA_TYPE } from '@carbon/ibmdotcom-web-components/es/components/cta/defs';
 import { boolean, select, text } from '@storybook/addon-knobs';