Add internal builtin topics as DdsTopic(s) [20039]

[juanlofer-eprosima]

PR #56 introduced a regression in which internal builtin topics were added as DistributedTopic instead of DdsTopic. As a consequence, these were not well processed when an allowlist was being provided (casting to DdsTopic failed).

[jepemi]

LGTM

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (76bd140) 65.15% compared to head (aefb4fa) 65.15%.

Files	Patch %	Lines
fastddsspy_tool/src/cpp/tool/Backend.cpp	0.00%	0 Missing and 3 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #60   +/-   ##
=======================================
  Coverage   65.15%   65.15%           
=======================================
  Files          22       22           
  Lines        1105     1105           
  Branches      389      389           
=======================================
  Hits          720      720           
  Misses        136      136           
  Partials      249      249           

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