MESH-1876/ When removing a permissioned operator, each of its associated nodes (stash keys) should be chilled

[JMoore96]

changelog

modified API

• Added new event for chill_from_governance function

modified logic

• Added new function chill_from_governance

[codecov]

Codecov Report

Merging #1317 (242467e) into develop (f10f523) will decrease coverage by 0.02%.
The diff coverage is 32.00%.

@@             Coverage Diff             @@
##           develop    #1317      +/-   ##
===========================================
- Coverage    43.90%   43.88%   -0.03%     
===========================================
  Files          141      141              
  Lines        29994    30043      +49     
===========================================
+ Hits         13170    13185      +15     
- Misses       16824    16858      +34     

Impacted Files	Coverage Δ
pallets/staking/src/offchain_election.rs	63.03% <0.00%> (-0.49%)	⬇️
pallets/staking/src/weights.rs	27.52% <0.00%> (ø)
pallets/weights/src/pallet_staking.rs	3.03% <0.00%> (-0.13%)	⬇️
pallets/staking/src/lib.rs	47.54% <43.24%> (+0.05%)	⬆️
pallets/identity/src/lib.rs	15.96% <0.00%> (-0.59%)	⬇️

[Neopallium]

• Add unit tests for the new extrinsic.

[Neopallium]

Just a little bit of cleanup and this PR is ready.

[Neopallium]

Approved, but the description should be improved to describe this new extrinsic.