Disable Sort for Summary Count

Description

Disable sort logic for _summary=count as summary count only returns the count of resources.

Describe how this change was tested.

Update the title of the PR to be succinct and less than 65 characters
Add a milestone to the PR for the sprint that it is merged (i.e. add S47)
Tag the PR with the type of update: Bug, Build, Dependencies, Enhancement, New-Feature or Documentation
Tag the PR with Open source, Azure API for FHIR (CosmosDB or common code) or Azure Healthcare APIs (SQL or common code) to specify where this change is intended to be released.
Tag the PR with Schema Version backward compatible or Schema Version backward incompatible or Schema Version unchanged if this adds or updates Sql script which is/is not backward compatible with the code.
[ ] CI is green before merge
Review squash-merge requirements

Patch|Skip|Feature|Breaking (reason)