Add @primer/octicons-react-symbols

[Copilot]

Summary

Ports primer/react#8029 into Octicons. The new @primer/octicons-react-symbols package reduces repeated SVG markup by rendering shared symbol definitions and lightweight references.

Changes

• Generates symbol and reference components for every Octicon.
• Exposes OcticonSymbols and createIconReference.
• Integrates workspace builds, releases, package validation, and browser tests.
• Adds package documentation and release metadata.

Usage

import {CheckIconReference, CheckSymbol, OcticonSymbols} from '@primer/octicons-react-symbols'

<OcticonSymbols symbols={[CheckSymbol]}>
  <CheckIconReference aria-label="Complete" />
</OcticonSymbols>

[changeset-bot]

🦋 Changeset detected

Latest commit: f70e2f5

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

This PR includes changesets to release 2 packages

Name	Type
@primer/octicons	Minor
@primer/octicons-react-symbols	Minor

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