[client-v2,jdbc-v2] Reading Array(Nullable(String)) with BinaryString enabled

### Description
There is a claim:
```
Nullable array strings wrong
High Severity

It looks like readArray is using the top-level readValue for nullable array elements when binaryStringSupport is enabled. This means nested String/FixedString inside Array(Nullable(...)) are read as StringValue instead of plain String. This goes against our rule for container types and could lead to ArrayStoreException or unexpected type mismatches.
```

https://github.com/ClickHouse/clickhouse-java/pull/2952/changes/BASE..c74bd36aae7fd863f0691654f65c87cc9c982415#r3632548114

首先跟踪 binaryStringSupport 启用时 readArray 及其对 readValue 的使用，重点关注 Array(Nullable(String)) 以及嵌套的 String 或 FixedString 值。确认容器返回的是普通 String 元素，而不是 StringValue，并验证生成的数组能够避免报告的类型不匹配或 ArrayStoreException。

由索引模型根据 Issue 内容生成。