fix(build): update package import paths with .js ext (#12110)

### Related Ticket(s)

Closes #12109

### Description

Adjusts import paths for recent additions that missed the `.js` file extension.

### Changelog

**Changed**

- Adjusts import paths for packages with strict package exports to add `.js` extension.

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packages/web-components/src/components/masthead/masthead-cart.ts

@@ -11,7 +11,7 @@ import StableSelectorMixin from '../../globals/mixins/stable-selector';
 import { html, LitElement } from 'lit';
 import { property, state } from 'lit/decorators.js';
 import settings from '@carbon/ibmdotcom-utilities/es/utilities/settings/settings.js';
-import { carbonElement as customElement } from '@carbon/web-components/es/globals/decorators/carbon-element';
+import { carbonElement as customElement } from '@carbon/web-components/es/globals/decorators/carbon-element.js';
 import ShoppingCart20 from '@carbon/web-components/es/icons/shopping--cart/20.js';
 import styles from './masthead.scss';
 import LocaleAPI from '@carbon/ibmdotcom-services/es/services/Locale/Locale.js';

packages/web-components/src/components/structured-list/structured-list-cell.ts

@@ -10,7 +10,7 @@
 import CDSStructuredListCell from '@carbon/web-components/es/components/structured-list/structured-list-cell.js';
 import { html } from 'lit';
 import { property } from 'lit/decorators.js';
-import { ifDefined } from 'lit/directives/if-defined';
+import { ifDefined } from 'lit/directives/if-defined.js';
 import Info16 from '@carbon/web-components/es/icons/information/16.js';
 import Checkmark20 from '@carbon/web-components/es/icons/checkmark/20.js';
 import Error20 from '@carbon/web-components/es/icons/error/20.js';

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

@@ -8,7 +8,7 @@
  */
 
 import { LitElement, html } from 'lit';
-import { carbonElement as customElement } from '@carbon/web-components/es/globals/decorators/carbon-element';
+import { carbonElement as customElement } from '@carbon/web-components/es/globals/decorators/carbon-element.js';
 import settings from '@carbon/ibmdotcom-utilities/es/utilities/settings/settings.js';
 import styles from './tile.scss';
 

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

@@ -8,11 +8,11 @@
  */
 
 import { LitElement, html } from 'lit';
-import { property, state, query } from 'lit/decorators';
-import { classMap } from 'lit/directives/class-map';
-import { carbonElement as customElement } from '@carbon/web-components/es/globals/decorators/carbon-element';
+import { property, state, query } from 'lit/decorators.js';
+import { classMap } from 'lit/directives/class-map.js';
+import { carbonElement as customElement } from '@carbon/web-components/es/globals/decorators/carbon-element.js';
 import settings from '@carbon/ibmdotcom-utilities/es/utilities/settings/settings.js';
-import { ifDefined } from 'lit/directives/if-defined';
+import { ifDefined } from 'lit/directives/if-defined.js';
 import CTAMixin from '../../component-mixins/cta/cta';
 import VideoCTAMixin from '../../component-mixins/cta/video';
 import { CTA_TYPE } from '../cta/defs';