Fixed filter query

[MartinM85]

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Add other supporting information, such as a description of the PR changes:

This PR fixes filter query which is missing the $count query parameter. Without the $count=true, the request fails with the error Request_UnsupportedQuery and message The specified filter to the reference property query is currently not supported. It's an advance query.

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[learn-build-service-prod]

Learn Build status updates of commit 3352055:

✅ Validation status: passed

File	Status	Preview URL	Details
api-reference/beta/api/user-list-sponsorof.md	✅Succeeded
api-reference/v1.0/api/user-list-sponsorof.md	✅Succeeded

For more details, please refer to the build report.

[v-regandowner]

@Jackson-Woods

Can you review the proposed changes?

IMPORTANT: When the changes are ready for publication, adding a #sign-off comment and the "ready-to-merge" label is the best way to signal that the PR is ready for the review team to merge.

[Danipocket]

hi! We can't review or approve PRs with major changes through this repo. Please direct internal contributors to submit their PRs through our private repo instead. External contributors can propose minor or cosmetic changes and for major changes, they should contact each workload directly.

[MartinM85]

Hi @Danipocket, what exactly are minor or cosmetic changes? Why can't I deliver changes that fixes broken examples? How can I contact the workload directly? Are there any exceptions for MVPs to deliver more than cosmetic changes?