fix(tokens): remove style dictionary scripts and reuse os tokens logic (#30786)

Issue number: internal

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issue. -->

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## What is the new behavior?
<!-- Please describe the behavior or changes that are being added by
this PR. -->

This pull request updates the design token build system and its
dependencies, simplifying the process and removing custom scripts in
favor of using the latest features of the `outsystems-design-tokens`
package. The changes modernize how design tokens are generated and
maintained, reducing custom code and leveraging upstream improvements.

Key changes include:

**Build Process Simplification:**
- The custom design token generation scripts
(`core/scripts/tokens/index.mjs` and `core/scripts/tokens/utils.mjs`)
have been removed. Token generation is now handled directly via the
`outsystems-design-tokens` package using an `npx` command in the
`build.tokens` script. This reduces maintenance overhead and keeps the
build process aligned with upstream best practices.
[[1]](diffhunk://#diff-0b9870c62ff80af860467e2541bba0b9ba5e7280b12bea6eeb124b1d174efbcfL1-L188)
[[2]](diffhunk://#diff-8b5c339d9dd13300954577213f84a443321a0d6477acd7553787fbcc00ce8cabL1-L320)
[[3]](diffhunk://#diff-7f67769260741e2563407af949f7e54fbf0431d1c607933f6e8a8094e3219e26L83-R82)

**Dependency Updates:**
- Updated `outsystems-design-tokens` to version `1.3.3` and
`style-dictionary` to version `5.1.1` in both `package.json` and
`package-lock.json`. This ensures compatibility with the latest features
and bug fixes and removes the need to specify `style-dictionary`
directly as a dependency.
[[1]](diffhunk://#diff-4ff996db8bece1eded512c3b97a6bde33622f94bb387634ef32496d832d57744L47-L52)
[[2]](diffhunk://#diff-4ff996db8bece1eded512c3b97a6bde33622f94bb387634ef32496d832d57744L9592-R9598)
[[3]](diffhunk://#diff-4ff996db8bece1eded512c3b97a6bde33622f94bb387634ef32496d832d57744L11137-R11138)
[[4]](diffhunk://#diff-7f67769260741e2563407af949f7e54fbf0431d1c607933f6e8a8094e3219e26L69-L74)

**SCSS Utility Import:**
- The `@forward "../../foundations/ionic.utility";` statement was
removed from `core/src/css/ionic/utils.bundle.ionic.scss`, likely
because the utility SCSS is now generated and managed by the new token
build process.

Removed CSS tests for Ionic theme, as they relied heavily on testing the
effect of the utility-classes, that are no longer created on the ionic
scope.

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

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below.
  2. Update the BREAKING.md file with the breaking change.
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---------

Co-authored-by: ionitron <hi@ionicframework.com>

core/scripts/testing/scripts.js

@@ -48,6 +48,15 @@
       document.head.appendChild(linkTag);
     }
 
+    const utilsBundleLinkTag = document.querySelector('link[href*="css/utils.bundle.css"]');
+    if (!utilsBundleLinkTag) {
+      const linkTag = document.createElement('link');
+      linkTag.setAttribute('rel', 'stylesheet');
+      linkTag.setAttribute('type', 'text/css');
+      linkTag.setAttribute('href', '/css/utils.bundle.css');
+      document.head.appendChild(linkTag);
+    }
+
     const defaultThemeLinkTag = document.querySelector('link[href*="css/ionic.bundle.css"]');
     if (defaultThemeLinkTag) {
       defaultThemeLinkTag.remove();