fix: include namespace in key of MySQLClients

[nakamasato]

Close #185

[codecov]

Codecov Report

Merging #189 (5d90608) into main (39536e7) will increase coverage by 0.19%.
The diff coverage is 71.42%.

@@            Coverage Diff             @@
##             main     #189      +/-   ##
==========================================
+ Coverage   65.32%   65.51%   +0.19%     
==========================================
  Files           6        6              
  Lines         522      522              
==========================================
+ Hits          341      342       +1     
  Misses        139      139              
+ Partials       42       41       -1     

Impacted Files	Coverage Δ
controllers/mysqldb_controller.go	46.66% <50.00%> (+4.00%)	⬆️
controllers/mysqluser_controller.go	68.55% <50.00%> (-2.07%)	⬇️
controllers/mysql_controller.go	59.64% <100.00%> (+1.75%)	⬆️

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