Refactor extra1 to fertilizer_pump in HAL and main logic

- Renamed `extra1` method and related calls to `fertilizer_pump` for clarity and better domain alignment.
- Updated HAL implementation to control `extra2` GPIO for fertilizer pump operations.
- Added build script trigger to refresh `VERGEN_BUILD_TIMESTAMP` on each build.

Software/MainBoard/rust/src/main.rs

@@ -733,9 +733,9 @@ pub async fn do_secure_pump(
                     &elapsed_minutes.to_string(),
                     "",
                 );
-                board.board_hal.extra1(true).await?;
+                board.board_hal.fertilizer_pump(true).await?;
                 Timer::after_millis(plant_config.fertilizer_s as u64 * 1000).await;
-                board.board_hal.extra1(false).await?;
+                board.board_hal.fertilizer_pump(false).await?;
                 info!("Fertilizer pump stopped");
 
                 // Store the current time as last fertilizer time