Get totalResults value by user count

[asha15]

Purpose

Resolve the issue: wso2/product-is#12813

When the SCIM API is invoked with a filter, the current behavior involves returning a predefined value for the totalResults parameter based on the MaxUserNameListLength, rather than reflecting the actual results that match the filter criteria. This fix addresses the issue by accurately determining the user count that corresponds to the given filter. To enable this fix, the following config should be added

[scim2]
enable_retrieve_totalresults_By_user_count = true

Related PR: wso2-extensions/identity-inbound-provisioning-scim2#533, wso2/carbon-identity-framework#5533

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Link: https://github.com/wso2/product-is/actions/runs/8186317203

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[jenkins-is-staging]

Approving the pull request based on the successful pr build https://github.com/wso2/product-is/actions/runs/8186317203