Fix ECS not remove taskset on quick sync rollback

[khanhtc1202]

What this PR does / why we need it:

In this PR I did

• Update rollback traffic routing condition, we only need to revert all traffic to primary target group in case of primary & canary target group config are available (ie. progressive sync)
• Instead of using clean function in rollback implementation to remove unused taskset, which can only remove CANARY taskset, for general use of rollback function, I use new defined GetServiceTaskSets to get all PRIMARY/ACTIVE tasksets of the current service before rolling back and remove them unused taskset later.
• Other changes are rearrange function code blocks to make the flow more like ECS deployment.

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

• How are users affected by this change:
• Is this breaking change:
• How to migrate (if breaking change):

[codecov]

Codecov Report

Patch coverage: 8.69% and project coverage change: +0.05% 🎉

Comparison is base (d3e748a) 29.89% compared to head (e814bba) 29.95%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4580      +/-   ##
==========================================
+ Coverage   29.89%   29.95%   +0.05%     
==========================================
  Files         220      220              
  Lines       25911    25933      +22     
==========================================
+ Hits         7745     7767      +22     
+ Misses      17519    17518       -1     
- Partials      647      648       +1     

Files Changed	Coverage Δ
pkg/app/piped/platformprovider/ecs/client.go	0.00% <0.00%> (ø)
pkg/app/piped/platformprovider/ecs/ecs.go	0.00% <ø> (ø)
...kg/app/piped/platformprovider/ecs/target_groups.go	85.71% <100.00%> (+85.71%)	⬆️

... and 2 files with indirect coverage changes

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[nghialv]

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