pkg/dumps.DumpTree: split to reduce complexity

[mmetc]

[github-actions[bot]]

@mmetc: There are no area labels on this PR. You can add as many areas as you see fit.

• /area agent
• /area local-api
• /area cscli
• /area appsec
• /area security
• /area configuration

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 85.71429% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 52.37%. Comparing base (b8ee31a) to head (b0ced8e). Report is 1 commits behind head on master.

Files	Patch %	Lines
pkg/dumps/parser_dump.go	85.71%	5 Missing and 1 partial :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3001      +/-   ##
==========================================
- Coverage   52.37%   52.37%   -0.01%     
==========================================
  Files         280      280              
  Lines       35422    35431       +9     
==========================================
+ Hits        18554    18557       +3     
- Misses      15027    15032       +5     
- Partials     1841     1842       +1     

Flag	Coverage Δ
bats	40.09% <90.00%> (+0.03%)	:arrow_up:
unit-linux	34.84% <0.00%> (-0.03%)	:arrow_down:
unit-windows	30.97% <0.00%> (-0.03%)	:arrow_down:

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