Add housekeeping leadership subscription

[hardillb]

Description

It appears the leadership subscription was missed when implemented.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.73%. Comparing base (036aafe) to head (2c12c29).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8466   +/-   ##
=======================================
  Coverage   76.73%   76.73%           
=======================================
  Files         460      460           
  Lines       24736    24736           
  Branches     6595     6595           
=======================================
  Hits        18980    18980           
  Misses       5756     5756           

Flag	Coverage Δ
backend	76.73% <ø> (ø)

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[hardillb]

Noticed while reviewing #8450 that we might not have a clean shutdown publish to remove the leader vote. Will fix before removing draft status

[hardillb]

Nevermind, found it

flowfuse/forge/comms/index.js

Line 124 in 37fcff2

client.publish('ff/v1/platform/leader', JSON.stringify({ id: client.platformId, vote: -1 }))