Standardize package file name exports

[taysea]

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What does this PR do?

This PR adjusts file name exports to:

• Rename default mode of "primitives" from "base" --> "default" (base is a category of token). Also updates the filename exports from "base.js" --> "primitives.js", etc.
• Removes "default" from CJS/ESM component token exports ("components.default.cjs" --> "components.js")
• Remove light/dark, medium/small modes from ESM/CommonJS exports. Now that these just return CSS variable refs, we don't need separate mode exports. "color.light.js --> color.js"

TO DO:

• Determine if we want "primitives" and "components" export to be plural or singular

Where should the reviewer start?

What testing has been done on this PR?

In addition to the feature you are implementing, have you checked the following:

General UX Checks

• Small, medium, and large screen sizes
• Cross-browsers (FireFox, Chrome, and Safari)
• Light & dark modes
• All hyperlinks route properly

Accessibility Checks

• Keyboard interactions
• Screen reader experience
• Run WAVE accessibility plugin (Chrome)

Code Quality Checks

• Console is free of warnings and errors
• Passes E2E commit checks
• Visual snapshots are reasonable

How should this be manually tested?

Any background context you want to provide?

Closes #4665

What are the relevant issues?

Screenshots (if appropriate)

Should this PR be mentioned in Design System updates?

Is this change backwards compatible or is it a breaking change?

[changeset-bot]

🦋 Changeset detected

Latest commit: 2f5f7b2

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
hpe-design-tokens	Minor

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