Add tests for CamelCaseStringEnumConverter case-insensitive deserialization

[Copilot]

CamelCaseStringEnumConverter gained a namesToValuesIgnoreCase fallback map but had no tests exercising that path, leaving the case-insensitive behavior unverified.

Changes

• Mixed-case theory test — DeserializesEnumValuesWithVariousCasings covers inputs like vAlUeOnE, ValueOne, VALUEONE, and valueone, ensuring they all resolve via the case-insensitive path when no exact camelCase match exists.
• Disambiguation test for case-different members — ExactCaseMatchTakesPriorityOverCaseInsensitiveWhenMembersDifferByCase verifies that when an enum has members differing only by case (Alpha = 1, ALPHA = 2), the case-sensitive lookup takes priority and the correct member is returned for each serialized form ("alpha", "aLPHA", "Alpha", "ALPHA").
• CaseDifferentMembers enum — helper enum added alongside CamelCaseEnum to support the disambiguation test.

enum CaseDifferentMembers
{
    Alpha = 1,
    ALPHA = 2,
}

// Exact camelCase form → case-sensitive hit
Deserialize<CaseDifferentMembers>("\"alpha\"")  // → Alpha
Deserialize<CaseDifferentMembers>("\"aLPHA\"")  // → ALPHA

// Field name form → case-sensitive hit (no fallback needed)
Deserialize<CaseDifferentMembers>("\"Alpha\"")  // → Alpha
Deserialize<CaseDifferentMembers>("\"ALPHA\"")  // → ALPHA

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