Re-work ECSS TM time handling

[robamu]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 95.74468% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 96.43%. Comparing base (b122ab6) to head (e51be34).

❗ Current head e51be34 differs from pull request most recent head 0eb1fe8. Consider uploading reports for the commit 0eb1fe8 to get more accurate results

Files	Patch %	Lines
spacepackets/ccsds/time/cds.py	87.50%	3 Missing ⚠️
spacepackets/ecss/pus_1_verification.py	93.75%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #76      +/-   ##
==========================================
- Coverage   96.44%   96.43%   -0.02%     
==========================================
  Files          94       94              
  Lines        7348     7350       +2     
==========================================
+ Hits         7087     7088       +1     
- Misses        261      262       +1     

Flag	Coverage Δ
unittests	96.43% <95.74%> (-0.02%)	⬇️

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