[e2e] Create mysql deployment in e2e instead of skaffold.yaml

[nakamasato]

related issues:

• [e2e] Check why Ping() doesn't return without Sleep #78
• [e2e] Slow to start/stop mysql in BeforeEach #82

[codecov]

Codecov Report

Merging #77 (f318ff9) into main (3875e65) will increase coverage by 1.04%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##             main      #77      +/-   ##
==========================================
+ Coverage   56.09%   57.14%   +1.04%     
==========================================
  Files           4        4              
  Lines         164      168       +4     
==========================================
+ Hits           92       96       +4     
- Misses         56       57       +1     
+ Partials       16       15       -1     

Impacted Files	Coverage Δ
controllers/mysqluser_controller.go	66.96% <75.00%> (+0.29%)	⬆️
controllers/mysql_controller.go	25.53% <0.00%> (+2.12%)	⬆️

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