smartctl-exporter error: DELL or MegaRaid controller, please try adding '-d megaraid,N'"

### Description

smartctl-exporter cannot check raid disks on DELL PERC H730P Adapter

### Charm revision

latest/stable

### Juju version

3.6.12

### Cloud

MAAS

### Expected behaviour

/de/sdm is a raid disk on the PRC controller. so Ii normally use:

smartctl -a -d megaraid,0 /dev/sdm
smartctl 7.2 2020-12-30 r5155 [x86_64-linux-5.15.0-151-generic] (local build)
Copyright (C) 2002-20, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Vendor: TOSHIBA
Product: AL15SEB060NY
Revision: EF09
Compliance: SPC-4
User Capacity: 600,127,266,816 bytes [600 GB]
Logical block size: 512 bytes
Formatted with type 2 protection
8 bytes of protection information per logical block
Rotation Rate: 10000 rpm
Form Factor: 2.5 inches
Logical Unit id: 0x5000039988323f79
Serial number: 79E0A1WGFQWF
Device type: disk
Transport protocol: SAS (SPL-3)
Local Time is: Fri Jan 9 10:12:15 2026 UTC
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
Temperature Warning: Disabled or Not Supported

=== START OF READ SMART DATA SECTION ===
SMART Health Status: OK

Current Drive Temperature: 28 C
Drive Trip Temperature: 65 C

Accumulated power on time, hours:minutes 41180:50
Manufactured in week 28 of year 2019
Specified cycle count over device lifetime: 50000
Accumulated start-stop cycles: 104
Specified load-unload count over device lifetime: 600000
Accumulated load-unload cycles: 104
Elements in grown defect list: 0

Error counter log:
Errors Corrected by Total Correction Gigabytes Total
ECC rereads/ errors algorithm processed uncorrected
fast | delayed rewrites corrected invocations [10^9 bytes] errors
read: 0 19 19 19 42 2154098.429 0
write: 0 0 0 0 0 175883.917 0
verify: 0 0 0 0 0 149600.518 0

Non-medium error count: 105

SMART Self-test log
Num Test Status segment LifeTime LBA_first_err [SK ASC ASQ]
Description number (hours)
# 1 Background long Completed - 2 - [- - -]
# 2 Background short Completed - 1 - [- - -]

Long (extended) Self-test duration: 3116 seconds [51.9 minutes]

### Reproduce / Test

install the charm in a DELL server with PERC H730P Adapter and create a raid disk

### Notes & References

full log
https://paste.ubuntu.com/p/TzfgZkY5yh/

Start by reproducing the reported smartctl command on a DELL PERC H730P RAID disk and review the full log at the linked paste. No source file, test, or entry point is named; done means the exporter can check and expose health for disks accessed with the megaraid device type.

Written by the indexing model from the issue text.