.Net: instead running two queries now a single query can do the same thing

[atiq-bs23]

Motivation and Context

1. Instead of executing two SQL queries, a single query can do the same thing.
2. Performance improvement

Description

Previously the InternalUpsertAsync method was executing two sql query by calling two individual methods - First UpdateAsync and then second InsertOrIgnoreAsync.

The new method uses the INSERT OR REPLACE statement to either update an existing row or insert a new one based on the unique collection and key combination

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows the SK Contribution Guidelines and the pre-submission formatting script raises no violations
• All unit tests pass, same unit test can detect the bug
• I didn't break anyone 😄

[atiq-bs23]

@microsoft-github-policy-service agree

[atiq-bs23]

@RogerBarreto should I remove the InsertOrIgnoreAsync method as there are no other reference where this method used.
I didn't remove this method in the current commit.