fix: rename S2_INSECURE to S2_SSL_NO_VERIFY

[sgbalogh]

... for the env var to disable SSL verification during tests.

Renamed to match s2-streamstore/s2-cli#210

[greptile-apps]

Greptile Overview

Greptile Summary

Renamed the environment variable from S2_INSECURE to S2_SSL_NO_VERIFY to align with the s2-cli naming convention.

• Updated the environment variable check in s2_config() function to use S2_SSL_NO_VERIFY instead of S2_INSECURE
• The functionality remains unchanged - when the variable is set, SSL certificate verification is disabled during tests
• No other occurrences of the old variable name found in the codebase

Confidence Score: 5/5

• This PR is safe to merge with minimal risk
• Simple variable rename with no functional changes, consistent across the codebase, and aligns with the naming convention used in the s2-cli project
• No files require special attention

Important Files Changed

Filename	Overview
tests/common/mod.rs	Renamed environment variable from S2_INSECURE to S2_SSL_NO_VERIFY for consistency with s2-cli

Sequence Diagram

sequenceDiagram
    participant Test as Test Suite
    participant Config as s2_config()
    participant Env as Environment Variables
    participant S2Config as S2Config Builder
    
    Test->>Config: Call s2_config(compression)
    Config->>Env: Check S2_ACCESS_TOKEN
    Env-->>Config: Return access token
    Config->>S2Config: Create S2Config::new(token)
    
    Config->>Env: Check S2_ACCOUNT_ENDPOINT & S2_BASIN_ENDPOINT
    alt Endpoints set
        Env-->>Config: Return endpoint values
        Config->>S2Config: with_endpoints()
    end
    
    Config->>Env: Check S2_SSL_NO_VERIFY
    alt SSL verification disabled
        Env-->>Config: Variable is set
        Config->>S2Config: with_insecure_skip_cert_verification(true)
    end
    
    Config->>S2Config: with_compression(compression)
    S2Config-->>Config: Return configured S2Config
    Config-->>Test: Return S2Config

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