Taskstate constant

[joelrebel]

What does this PR implement/change/remove?

Updates the FirmwareTaskVerifier interface and its implementations to return a constant.TaskState type.

Checklist

• [X] Tests added
• [X] Similar commits squashed

[codecov[bot]]

Codecov Report

Attention: 17 lines in your changes are missing coverage. Please review.

Comparison is base (b0ef181) 44.29% compared to head (6c585e6) 44.40%.

Files	Patch %	Lines
providers/supermicro/x11_firmware_bios.go	0.00%	11 Missing :warning:
providers/supermicro/x11_firmware_bmc.go	71.42%	2 Missing :warning:
client.go	0.00%	1 Missing :warning:
providers/supermicro/firmware.go	0.00%	1 Missing :warning:
providers/supermicro/x11.go	0.00%	1 Missing :warning:
providers/supermicro/x12.go	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #368 +/- ## ========================================== + Coverage 44.29% 44.40% +0.10% ========================================== Files 61 61 Lines 5145 5155 +10 ========================================== + Hits 2279 2289 +10 Misses 2610 2610 Partials 256 256 ```

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