Add disk IO metrics for completed and errored commands in e2e output

- Introduced new metrics: `node_disk_iodone_total` and `node_disk_ioerr_total` to track completed and errored IO commands respectively.
- Updated the e2e output to reflect these changes.

Signed-off-by: Muhammad Shahzeb <[email protected]>

Author: mshahzeb

collector/fixtures/e2e-output.txt

@@ -576,6 +576,14 @@ node_disk_io_time_weighted_seconds_total{device="sdb"} 67.07000000000001
 node_disk_io_time_weighted_seconds_total{device="sdc"} 17.07
 node_disk_io_time_weighted_seconds_total{device="sr0"} 0
 node_disk_io_time_weighted_seconds_total{device="vda"} 2.0778722280000001e+06
+# HELP node_disk_iodone_total Number of completed or rejected IO commands.
+# TYPE node_disk_iodone_total counter
+node_disk_iodone_total{device="sda"} 307
+node_disk_iodone_total{device="sr0"} 2767
+# HELP node_disk_ioerr_total Number of IO commands that completed with an error.
+# TYPE node_disk_ioerr_total counter
+node_disk_ioerr_total{device="sda"} 3
+node_disk_ioerr_total{device="sr0"} 29
 # HELP node_disk_read_bytes_total The total number of bytes read successfully.
 # TYPE node_disk_read_bytes_total counter
 node_disk_read_bytes_total{device="dm-0"} 5.13708655616e+11
@@ -2993,6 +3001,7 @@ node_scrape_collector_success{collector="dmi"} 1
 node_scrape_collector_success{collector="drbd"} 1
 node_scrape_collector_success{collector="edac"} 1
 node_scrape_collector_success{collector="entropy"} 1
+node_scrape_collector_success{collector="ext4"} 1
 node_scrape_collector_success{collector="fibrechannel"} 1
 node_scrape_collector_success{collector="filefd"} 1
 node_scrape_collector_success{collector="hwmon"} 1