[ACA-3973] K8s image - fetch all the namespaces and handle the missing container

[mauriziovitale]

… case of missing container for a label

Please check if the PR fulfills these requirements

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (check one with "x")

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation
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• No

If this PR contains a breaking change, please describe the impact and migration path for existing applications: ...

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[codecov-commenter]

Codecov Report

Merging #6148 into develop will increase coverage by 1.51%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #6148      +/-   ##
===========================================
+ Coverage    76.28%   77.80%   +1.51%     
===========================================
  Files          850      143     -707     
  Lines        18978     4005   -14973     
  Branches      3752      801    -2951     
===========================================
- Hits         14477     3116   -11361     
+ Misses        3366      630    -2736     
+ Partials      1135      259     -876     

Impacted Files	Coverage Δ
lib/core/services/search.service.ts
...gram/components/diagram-sequence-flow.component.ts
...lib/task/task-header/mocks/fake-claim-task.mock.ts
lib/core/services/translation.service.ts
...ts/dynamic-table/editors/boolean/boolean.editor.ts
...nents/raphael/icons/raphael-icon-mule.component.ts
...process-list/components/start-process.component.ts
...le/directives/custom-loading-template.directive.ts
.../task/task-header/mocks/fake-complete-task.mock.ts
...onents/activities/diagram-script-task.component.ts
... and 698 more

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