[release/9.0] Fix ModelMetadata for TryParse-parameters in ApiExplorer

[captainsafia]

Description

This PR fixes the handling for schemas associated with types that implement a custom TryParse and are consumed from either the route or query string.

Fixes #58318

Customer Impact

Without this change, APIs that bind parameters from the query string or URL will produce invalid schemas if the type being bound to implements a TryParse method or the IParsable interface.

There are workarounds for this scenario (using schema transformers) but it requires users add a fair bit of code in their own applications and this fix is small enough to warrant improving the QoL for this.

Example of impacted scenario

app.MapGet("/student/{student}", (Student student) => $"Hi {student.Name}");

public record Student(string Name)
{
    public static bool TryParse(string value, out Student? result)
    {
        if (value is null)
        {
            result = null;
            return false;
        }

        result = new Student(value);
        return true;
    }
}

Regression?

• Yes
• No

Risk

• High
• Medium
• Low

Change localized to OpenAPI support + TryParsable parameters in the route query.

Verification

• Manual (required)
• Automated

Packaging changes reviewed?

• Yes
• No
• N/A