chore: use callbacks as one nested function chain

[MatousJobanek]

• instead of calling callbacks in a loop nest all functions into one function and call it once - is better for handling the returned values and call results
• remove unused callback
• make warn log (that waits for complete deletion of pvc) shorter

[codecov[bot]]

Codecov Report

Merging #740 into develop will increase coverage by 0.26%. The diff coverage is 80.68%.

@@             Coverage Diff             @@
##           develop     #740      +/-   ##
===========================================
+ Coverage    74.97%   75.24%   +0.26%     
===========================================
  Files           37       37              
  Lines         3005     3013       +8     
===========================================
+ Hits          2253     2267      +14     
+ Misses         568      561       -7     
- Partials       184      185       +1

Impacted Files	Coverage Δ
openshift/methods.go	97.97% <100%> (+0.51%)	:arrow_up:
openshift/action.go	83.73% <100%> (ø)	:arrow_up:
openshift/client.go	76.27% <100%> (ø)	:arrow_up:
openshift/endpoints.go	92.85% <100%> (+1.68%)	:arrow_up:
utils/error.go	80% <33.33%> (-20%)	:arrow_down:
openshift/callback.go	78.03% <77.14%> (+2.03%)	:arrow_up:
auth/service.go	73.73% <0%> (-0.93%)	:arrow_down:
update/update.go	82.24% <0%> (+1.86%)	:arrow_up:

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