Draft: Eliminate firing an extra count query on GraphQL API

What does this MR do?

While calculating the hasPreviousPage and hasNextPage attribute of the pageInfo we are currently firing a count query to check if there are more records. Instead of firing that count query what we can do is basically fetching one more record from database and then check if we had the extra record in the resultset to determine hasNextPage & hasPreviousPage.

Related to #219186.

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• [-] Separation of EE specific content

Availability and Testing

• [-] Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• [-] Tested in all supported browsers
• [-] Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• [-] Label as security and @ mention @gitlab-com/gl-security/appsec
• [-] The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• [-] Security reports checked/validated by a reviewer from the AppSec team