Unify __type__ on filesystems and containers

[Schamper]

Depends on #443 for doing the same with volume systems.

[codecov]

Codecov Report

Attention: 8 lines in your changes are missing coverage. Please review.

Comparison is base (a90e389) 74.35% compared to head (4a089ee) 74.37%.

Files	Patch %	Lines
dissect/target/plugins/os/unix/_os.py	0.00%	3 Missing ⚠️
dissect/target/plugins/os/unix/linux/esxi/_os.py	0.00%	2 Missing ⚠️
dissect/target/container.py	80.00%	1 Missing ⚠️
dissect/target/filesystem.py	92.30%	1 Missing ⚠️
...ect/target/plugins/filesystem/ntfs/mft_timeline.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #444      +/-   ##
==========================================
+ Coverage   74.35%   74.37%   +0.02%     
==========================================
  Files         258      258              
  Lines       20640    20661      +21     
==========================================
+ Hits        15346    15366      +20     
- Misses       5294     5295       +1     

Flag	Coverage Δ
unittests	74.37% <87.09%> (+0.02%)	⬆️

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