Allow passing JsonSerializerOptions to a request mock

[Copilot]

Adds a Using(JsonSerializerOptions) method to RequestMockBuilder so custom serialization settings (e.g. naming policies, converters) propagate consistently to all JSON operations on that mock — body matching and response serialization alike.

Changes

• RequestMockBuilder: Added jsonSerializerOptions field and Using(JsonSerializerOptions) fluent method (with null guard). Updated all JsonSerializer.Serialize() call sites — WithBody(object), RespondsWithJsonContent, and both JSON-serializing RespondsWithODataResult overloads — to forward the configured options. Options are captured into a local before lambdas to avoid closing over a mutable field.
• API verification files: Updated net8.0.verified.txt and net472.verified.txt to reflect the new public method.

Example

var options = new JsonSerializerOptions { PropertyNamingPolicy = JsonNamingPolicy.CamelCase };

mock.ForGet()
    .WithPath("/api/users")
    .Using(options)
    .RespondsWithJsonContent(new { UserId = 42, UserName = "Alice" });
// Response body: {"userId":42,"userName":"Alice"}

mock.ForPost()
    .WithPath("/api/users")
    .Using(options)
    .WithBody(new { UserId = 42, UserName = "Alice" })  // matches camelCase JSON
    .RespondsWithStatus(HttpStatusCode.Created);

Original prompt

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This section details on the original issue you should resolve

<issue_title>Allow passing JsonSerializerOptions to a request mock</issue_title>
<issue_description>Add a Using method on RequestMockBuilder that takes a JsonSerializerOptions object that will be used everywhere in that mock where the JsonSerializer is used.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Allow passing JsonSerializerOptions to a request mock #81

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[github-actions]

Test Results

  3 files  ±0    3 suites  ±0   4s ⏱️ -2s
131 tests +2  131 ✅ +2  0 💤 ±0  0 ❌ ±0 
256 runs  +4  256 ✅ +4  0 💤 ±0  0 ❌ ±0 

Results for commit 8989ad2. ± Comparison against base commit 45b198f.

[coveralls]

Pull Request Test Coverage Report for Build 22918576764

Details

• 12 of 14 (85.71%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.06%) to 83.315%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
Mockly/RequestMockBuilder.cs	12	14	85.71%

Totals
Change from base Build 22918158276:	-0.06%
Covered Lines:	1206
Relevant Lines:	1381

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💛 - Coveralls