[release/10.0] Fix named query filter conventions

[Copilot]

Fixes #37708
Port of #37710

Description

Named query filters set by conventions cannot be overridden by explicit configuration in user code because of a missing ConfigurationSource in the implementation.

Customer impact

Customers who use conventions to automatically set named query filters cannot override those filters with explicit configuration in their OnModelCreating method.

There is no workaround other than not using named query filters or removing the convention entirely.

How found

Customer reported on 10.0.3

Regression

No, named query filters is a new feature in EF 10

Testing

Test added.

Risk

Low. The change is minimal.

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[AndriySvyryd]

@copilot Update progress by rewriting the PR summary using this template:

Fixes #{number}

**Description**
{Issue description}

**Customer impact**
{How does the reported issue affects customer's app? Are there workarounds?}

**How found**
{Was it customer reported or found during verification? How many customers are affected?}

**Regression**
{Is it a regression from a released version? Which one?}

**Testing**
{How the changes were tested}

**Risk**
{Low/Medium/High, argument why}

[Copilot]

@copilot Update progress by rewriting the PR summary using this template:

Done. The PR description has been updated using the servicing template.

[Copilot]

Pull request overview

Ports the EF 10 fix for named query filter override behavior so that filters added by conventions can be overridden by explicit user configuration during model building.

Changes:

• Set ConfigurationSource.Explicit when creating named QueryFilter instances via EntityTypeBuilder.HasQueryFilter(string, ...).
• Add a regression test validating convention-set named filters can be overridden via the public API.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/EFCore/Metadata/Builders/EntityTypeBuilder.cs	Ensures named query filters created through the public builder carry ConfigurationSource.Explicit, enabling proper override semantics.
test/EFCore.Tests/Metadata/Internal/InternalEntityTypeBuilderTest.cs	Adds coverage for overriding convention-set named query filters via explicit configuration.

[artl93]

New feature. Customer reported. Approved.