[release/9.0] Don't throw exception for parameters with custom binding source

[github-actions]

Backport of #59035 to release/9.0

/cc @captainsafia

Description

This change ensures that parameters with custom binding sources do not throw exceptions. Users will need to set the parameter location themselves via transformers, as this information cannot be determined implicitly. Additionally, if users want to specify a custom binder for a parameter from the body, they must define the binding source correctly on the model binder to ensure the argument appears under the requestBody field of the operation instead of the parameters field.

Fixes #59013

Customer Impact

No accessible workarounds are available for this change. This impacts APIs that use third-party packages which implement custom model binding rules for parameters sourced from the request's URL route, like Oqtane and Asp.Versioning.

Regression?

• Yes
• No

Risk

• High
• Medium
• Low

Low risk because change is localized to:

• APIs associated with MVC-based applications
• That use route or query parameters
• And have custom model binding logic provided

Verification

• Manual (required)
• Automated

Packaging changes reviewed?

• Yes
• No
• N/A

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