Add "Reset" epics signal

[shihab-dls]

Fixes 505

Instructions to reviewer on how to test:

1. Check if correct signal has been added to clear robot error
2. Check if amended error_code type is fine

Checks for reviewer

• Would the PR title make sense to a scientist on a set of release notes
• If a new device has been added does it follow the standards
• If changing the API for a pre-existing device, ensure that any beamlines using this device have updated their Bluesky plans accordingly
• Have the connection tests for the relevant beamline(s) been run via dodal connect ${BEAMLINE}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.44%. Comparing base (5a4a7ab) to head (00858ea).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #968   +/-   ##
=======================================
  Coverage   97.44%   97.44%           
=======================================
  Files         144      144           
  Lines        6139     6140    +1     
=======================================
+ Hits         5982     5983    +1     
  Misses        157      157           

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[olliesilvester]

Looks good, thanks! See suggested variable name though