chore(backport release-0.9): fix(indexer): extract Apps from Promotion directives

[akuitybot]

Automated backport to release-0.9, triggered by a label in #2620.

[codecov]

Codecov Report

Attention: Patch coverage is 46.47887% with 38 lines in your changes missing coverage. Please review.

Project coverage is 50.97%. Comparing base (a1d0a4c) to head (504d3a8).
Report is 1 commits behind head on release-0.9.

Files with missing lines	Patch %	Lines
internal/indexer/indexer.go	50.00%	11 Missing and 1 partial ⚠️
internal/controller/stages/stages.go	61.90%	8 Missing ⚠️
internal/api/kubernetes/client.go	0.00%	6 Missing ⚠️
cmd/controlplane/garbage_collector.go	0.00%	3 Missing ⚠️
internal/controller/stages/watches.go	0.00%	3 Missing ⚠️
internal/api/option/auth.go	0.00%	2 Missing ⚠️
cmd/controlplane/webhooks.go	0.00%	1 Missing ⚠️
internal/api/list_project_events_v1alpha1.go	0.00%	1 Missing ⚠️
internal/api/list_promotions_v1alpha1.go	0.00%	1 Missing ⚠️
internal/controller/promotions/promotions.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           release-0.9    #2621      +/-   ##
===============================================
- Coverage        50.97%   50.97%   -0.01%     
===============================================
  Files              283      283              
  Lines            21064    21088      +24     
===============================================
+ Hits             10737    10749      +12     
- Misses            9653     9664      +11     
- Partials           674      675       +1     

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