Fix: Restore EntityName after processing nested filter for CosmosDB

[TomasDJo]

Why make this change?

• Closes [Bug]: Filtering on multiple different nested objects returns AuthorizationCheckFailed (CosmosDB, GraphQL) #3070
• When filtering on multiple different nested objects in CosmosDB (e.g., toOwnership and fromOwnership), the query fails with AuthorizationCheckFailed error even though the user has proper permissions.

What is this change?

When processing non-list nested object filters for CosmosDB in GQLFilterParser.Parse(), the EntityName property of cosmosQueryStructure is mutated to the nested type name but not restored after the recursive parsing completes.

This causes subsequent nested filters to use the wrong entity name for authorization checks:

1. First nested filter (e.g., toOwnership) → EntityName set to "ToOwnership"
2. DatabaseObject.Name and SourceAlias are restored ✓
3. EntityName is NOT restored ✗ (still "ToOwnership")
4. Second nested filter (e.g., fromOwnership) → authorization check uses wrong entity → fails

The fix adds a single line to restore EntityName alongside the existing restoration of DatabaseObject.Name and SourceAlias.

How was this tested?

• Manual testing against real CosmosDB with nested filter queries
• Integration Tests (CosmosDB emulator not available locally)
• Unit Tests

Before fix:

{"errors":[{"message":"Access forbidden to a field referenced in the filter.","extensions":{"code":"AuthorizationCheckFailed"}}],"data":null}

After fix:

{"data":{"transactions":{"items":[{"id":"31654581"},{"id":"28285539"}]}}}

Sample Request(s)

# This query failed before the fix
{
  transactions(filter: {
    toOwnership: { toOwnerType: { eq: "Privat" } },
    fromOwnership: { fromOwnerType: { eq: "Privat" } }
  }, first: 2) {
    items { id }
  }
}

[Copilot]

Pull request overview

This PR fixes a bug in CosmosDB nested filter processing where the EntityName property was not being restored after processing non-list nested object filters, causing authorization failures when filtering on multiple different nested objects.

Changes:

• Added restoration of EntityName property in GQLFilterParser.Parse() method after recursive parsing of non-list nested filters for CosmosDB

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[JerryNixon]

@copilot evaluate the efficacy of this PR to resolve the issue at hand.

[RubenCerna2079]

@TomasDJo would you be able to add some unit tests on this PR to verify that the change you made works as intended?
If you have any problems with this let me know and I should be able to help you.