feature(api): add refiller index goroutine for search index

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Refiller goroutine

Repopulates the search index thereby removing memory leaks that appeared when filling, updating and searching the index. Also removed memory leaks in tests and refactoring

TODO: add tests for refiller

[codecov-commenter]

Codecov Report

Merging #907 (ba36990) into master (9d54d2f) will decrease coverage by 0.56%.
Report is 3 commits behind head on master.
The diff coverage is 34.28%.

❗ Current head ba36990 differs from pull request most recent head f15b5f8. Consider uploading reports for the commit f15b5f8 to get more accurate results

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@@            Coverage Diff             @@
##           master     #907      +/-   ##
==========================================
- Coverage   68.93%   68.38%   -0.56%     
==========================================
  Files         195      197       +2     
  Lines       10866    11050     +184     
==========================================
+ Hits         7491     7556      +65     
- Misses       2934     3050     +116     
- Partials      441      444       +3     

Files Changed	Coverage Δ
cmd/api/main.go	0.00% <0.00%> (ø)
database/redis/subscription.go	75.36% <0.00%> (-2.64%)	⬇️
database/redis/trigger.go	72.46% <0.00%> (-6.28%)	⬇️
metric_source/prometheus/prometheus.go	46.66% <ø> (ø)
index/batch.go	57.01% <6.66%> (-30.83%)	⬇️
index/metrics.go	51.85% <20.00%> (-18.74%)	⬇️
index/sweepper.go	54.54% <20.00%> (-10.17%)	⬇️
index/actualizer.go	66.66% <27.27%> (-3.65%)	⬇️
index/refiller.go	31.42% <31.42%> (ø)
cmd/api/trigger_stats.go	35.71% <35.71%> (ø)
... and 10 more

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[github-actions]

Build and push Docker images with tag: feature-add-refiller-goroutine.2023-09-12.856b735

[github-actions]

Build and push Docker images with tag: feature-add-refiller-goroutine.2023-09-12.856b735

[github-actions]

Build and push Docker images with tag: feature-add-refiller-goroutine.2023-09-12.856b735

[kissken]

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