feat(tokens): update tokens architecture and usage (#29950)

Issue number: internal

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

- Removed old tokens stored on foundations folder. Now the jsons with
the tokens come from the new dependency:
https://github.com/OutSystems/outsystems-design-tokens.
- The tokens from UX Team completely changed the structure and in some
cases the values. Everything was replaced on the project to use the new
tokens.
- Snapshots updated and differences reviewed with UX Team. A fix was
done on the testing css, to make sure the correct _Inter_ font-family
was actually used. This resulted in some differences on the text for
some componentes, that had snapshots with the native fonts.
- Removed generation of scss file on tokens script, that contained the
:root selector with the custom CSS properties, as they were not used on
the Ionic context.
- Removed generation of html file with tokens preview, as there wasn't a
great value on this (we have storybook on other contexts) and it allowed
to reduce a lot of code and complexity from the tokens script.
- The token command was adapted to use the command available from the
https://github.com/OutSystems/outsystems-design-tokens package, using
the `--config` prop, where we pass the path to our Ionic token script,
where we generate the needed scss variables and utility-classes (by
default the tokens repo tries to be as agnostic as possible, and only
generates the css variables, without the prefix and added details we
need on the Ionic side).
- Removed the token command from the npm run build, as it unnecessarily
added time on that command to run. Besides, it should not be common that
we need to run this command in the future.
- Updated reference to latest version of [Style Dictionary
4.1.3](https://v4.styledictionary.com/version-4/statement/). Version 4
comes with a lot of improvements, but also breaking-changes, so it was
needed to adapt the tokens script. The code on the script is also now
cleaner.
- Changed prefix from ionic to ion. The term ionic was used initially,
to help differentiate from the old ios/md stuff, but I feel with the
current scss architecture, that is no longer needed, and we can use the
same prefix across themes.

This requires to run `npm install ` again.

## Does this introduce a breaking change?

- [x] Yes
- [ ] No

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Co-authored-by: ionitron <hi@ionicframework.com>
Co-authored-by: Maria Hutt <thetaPC@users.noreply.github.com>

core/scripts/testing/styles.css

@@ -49,8 +49,15 @@ html.ios.ios {
   font-family: -apple-system, BlinkMacSystemFont, "iosTestingFont", sans-serif;
 }
 
-:root.ionic {
+/* Override above styles for testing scopes */
+:root.ionic,
+:root.ionic.ios,
+:root.ionic.md,
+html.ionic,
+html.ionic.ios,
+html.ionic.md {
   --ionic-global-background-color: var(--background);
+  --ion-font-family: initial;
 }
 
 /**