fix: error out if there is no active service

[Lou1415926]

Otherwise panic when accessing activeSvc[0].

I think erroring out makes sense here, because this is basically the same scenario as when "resourceGroupAPI" returns nothing given the tags:

services, err := c.rgGetter.GetResourcesByTags(serviceResourceType, tags)
if err != nil {
  return nil, fmt.Errorf("get ECS service with tags %s: %w", tags.String(), err)
}
if len(services) == 0 {
  return nil, fmt.Errorf("no ECS service found with tags %s", tags.String())
}

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[github-actions]

🍕 Here are the new binary sizes!

Name	New size (kiB)	size (kiB)	Delta (%)
macOS (amd)	51892	51740	+0.29
macOS (arm)	52740	52596	+0.27
linux (amd)	45636	45496	+0.31
linux (arm)	44932	44804	+0.29
windows (amd)	43100	42968	+0.31

[github-actions]

🍕 Here are the new binary sizes!

Name	New size (kiB)	size (kiB)	Delta (%)
macOS (amd)	51892	51740	+0.29
macOS (arm)	52740	52596	+0.27
linux (amd)	45636	45496	+0.31
linux (arm)	44932	44804	+0.29
windows (amd)	43100	42968	+0.31

[codecov-commenter]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (5db2bc7) 69.80% compared to head (1fdedf1) 69.80%.

Additional details and impacted files

@@            Coverage Diff            @@
##           mainline    #5336   +/-   ##
=========================================
  Coverage     69.80%   69.80%           
=========================================
  Files           296      296           
  Lines         44758    44761    +3     
  Branches        287      287           
=========================================
+ Hits          31244    31247    +3     
  Misses        11996    11996           
  Partials       1518     1518           

Files	Coverage Δ
internal/pkg/ecs/ecs.go	85.41% <100.00%> (+0.13%)	⬆️

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