[DPE-3887] Add log for fix_leader_annotation method

[marceloneppel]

Issue

We don't know all the moments when the leader annotation is fixed (we know that one situation - expected - is after a scale down to 0 units and then a scale up to 1 unit), which causes the cluster_initialised flag to be removed from the peer relation data.

Solution

Add a log for the fix_leader_annotation method.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.73%. Comparing base (63057a7) to head (e2d5bb9).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #678   +/-   ##
=======================================
  Coverage   70.72%   70.73%           
=======================================
  Files          11       11           
  Lines        2951     2952    +1     
  Branches      514      514           
=======================================
+ Hits         2087     2088    +1     
  Misses        754      754           
  Partials      110      110           

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