fix(backend): Populate members_count of an Organization

[panteliselef]

Description

members_count was not populated even if users would explicitly ask to be returned.
clerkClient.organizations.getOrganizationList({ includeMembersCount: true, });

Turns out the property has never populated in the first place

Checklist

• npm test runs as expected.
• npm run build runs as expected.
• (If applicable) JSDoc comments have been added or updated for any package exports
• (If applicable) Documentation has been updated

Type of change

• 🐛 Bug fix
• 🌟 New feature
• 🔨 Breaking change
• 📖 Refactoring / dependency upgrade / documentation
• other:

Packages affected

• @clerk/clerk-js
• @clerk/clerk-react
• @clerk/nextjs
• @clerk/remix
• @clerk/types
• @clerk/themes
• @clerk/localizations
• @clerk/clerk-expo
• @clerk/backend
• @clerk/clerk-sdk-node
• @clerk/shared
• @clerk/fastify
• @clerk/chrome-extension
• gatsby-plugin-clerk
• build/tooling/chore

[changeset-bot]

🦋 Changeset detected

Latest commit: a4c09ac

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

This PR includes changesets to release 6 packages

Name	Type
@clerk/backend	Patch
@clerk/fastify	Patch
gatsby-plugin-clerk	Patch
@clerk/nextjs	Patch
@clerk/remix	Patch
@clerk/clerk-sdk-node	Patch

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