Remove indexed maps that are not used along the code

[jparisu]

Merge after:

• Add flaky test labels and update CI so flakys are run in another job #175

[MiguelCompany]

Two general comments:

1. If we are removing the collections, shouldn't we just remove the corresponding tests instead of modifying them?
2. Linters

[MiguelCompany]

LGTM with green CI. We'll leave the tests there till we check whether we have other tests checking the same things indirectly.

[MiguelCompany]

LGTM

[codecov]

Codecov Report

Base: 0.00% // Head: 57.82% // Increases project coverage by +57.82% 🎉

Coverage data is based on head (736d776) compared to base (4676eb2).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff            @@
##           main     #178       +/-   ##
=========================================
+ Coverage      0   57.82%   +57.82%     
=========================================
  Files         0       31       +31     
  Lines         0     4320     +4320     
  Branches      0     2310     +2310     
=========================================
+ Hits          0     2498     +2498     
- Misses        0       60       +60     
- Partials      0     1762     +1762     

Impacted Files	Coverage Δ
src/cpp/database/database.cpp	51.47% <ø> (ø)
src/cpp/database/database.hpp	65.06% <ø> (ø)
...c/cpp/subscriber/StatisticsParticipantListener.cpp	48.67% <0.00%> (ø)
src/cpp/database/data.cpp	100.00% <0.00%> (ø)
src/cpp/subscriber/StatisticsReaderListener.cpp	50.00% <0.00%> (ø)
src/cpp/database/database_queue.cpp	54.80% <0.00%> (ø)
...lude/fastdds_statistics_backend/types/EntityId.hpp	100.00% <0.00%> (ø)
.../cpp/detail/data_aggregators/MaximumAggregator.ipp	100.00% <0.00%> (ø)
src/cpp/database/database_queue.hpp	63.69% <0.00%> (ø)
... and 23 more

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