fix: Rename API Reference to Directives and Store API Reference

[PoloSpark]

Fixes #61207

Rename the "API Reference" to "Directives and Store API Reference" in the Interactivity API documentation.

• Rename the file docs/reference-guides/interactivity-api/api-reference.md to docs/reference-guides/interactivity-api/directives-store-api-reference.md.
• Update the title in directives-store-api-reference.md to "Directives and Store API Reference".
• Update the reference in docs/toc.json from "api-reference.md" to "directives-store-api-reference.md".
• Update the mention of "API Reference" to "Directives and Store API Reference" in the navigation section of docs/reference-guides/interactivity-api/README.md.

[github-actions]

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[github-actions]

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