Improve netplan and networkd support

[JSCU-CNI]

This PR improves the support and robustness for static and dynamic netplan configuration parsing on linux targets.

1. added tests for static netplan configurations
2. the messages plugin now parses /var/lib/installer/syslog* and /var/lib/cloud-init.log as well.
3. parse_unix_dhcp_log_messages now searches output from the messages and journal plugins
4. ips no longer breaks when encountering malformed or empty yaml files

[codecov]

Codecov Report

Attention: Patch coverage is 90.54054% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 73.99%. Comparing base (a0c6c9f) to head (3793004).

❗ Current head 3793004 differs from pull request most recent head ee7b0e1. Consider uploading reports for the commit ee7b0e1 to get more accurate results

Files	Patch %	Lines
dissect/target/helpers/network_managers.py	90.47%	4 Missing ⚠️
dissect/target/plugins/os/unix/log/messages.py	90.62%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #550      +/-   ##
==========================================
- Coverage   74.02%   73.99%   -0.03%     
==========================================
  Files         285      284       -1     
  Lines       23578    23534      -44     
==========================================
- Hits        17454    17415      -39     
+ Misses       6124     6119       -5     

Flag	Coverage Δ
unittests	73.99% <90.54%> (-0.03%)	⬇️

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 90.76923% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 74.97%. Comparing base (f433711) to head (e3d5ce1).

Files	Patch %	Lines
dissect/target/helpers/network_managers.py	89.74%	4 Missing ⚠️
dissect/target/plugins/os/unix/log/messages.py	92.30%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #550      +/-   ##
==========================================
+ Coverage   74.93%   74.97%   +0.04%     
==========================================
  Files         288      288              
  Lines       24145    24172      +27     
==========================================
+ Hits        18093    18124      +31     
+ Misses       6052     6048       -4     

Flag	Coverage Δ
unittests	74.97% <90.76%> (+0.04%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

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[Horofic]

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