Add "Show Time" Parameter to Log Panel Controls for Optional Timestamp Display

**Why is this needed**: Some applications include date and time information directly in their log messages, making Grafana's built-in timestamp column redundant and cluttering the Log panel display. Conversely, other applications generate logs without date and time in the message, where the timestamp column is essential for context. Currently, users cannot toggle the timestamp column, forcing them to view redundant or insufficient information depending on their log format, which impacts readability and usability. **What would you like to be added**: Add a "Show Time" toggle in the Log panel controls to allow users to enable or disable the timestamp column. When enabled, the timestamp column is displayed; when disabled, it is hidden, showing only the log message and other configured fields. **Who is this feature for?** This feature is for Grafana users who work with log data (e.g., via Loki or Elasticsearch data sources), particularly those managing logs from diverse applications with varying timestamp formats. It benefits developers, system administrators, and data analysts who need flexible visualization options to improve log readability and reduce visual clutter.