Fix quotes

[hack3rvaillant]

Switch from double quotes to single quotes in curl commands

Summary

This PR changes the quoting style in generated curl commands from double quotes to single quotes. This makes the generated commands more compatible with various shell environments and avoids common escaping issues when working with JSON payloads.

Changes

• Changed all -d "..." parameters to use single quotes: -d '...'
• Changed all -H "..." header parameters to use single quotes: -H '...'
• Updated the escaping pattern in jsonContentToString() to handle single quotes instead of double quotes
• Updated all test snapshots to reflect the new quoting style

Benefits

• Improved compatibility with different shell environments
• Easier to copy-paste commands that contain JSON with double quotes
• More consistent with common curl usage patterns in documentation and examples

Testing

All existing tests pass with the updated snapshots.