remove get_highest_tag_version from converters

[CagtayFabry]

Changes

• remove get_highest_tag_version and use default tag selection in TimeSeries and SpatialData converters

Checks

• updated CHANGELOG.rst

[github-actions]

Test Results

2 184 tests  ±0   2 183 ✔️ ±0   2m 41s ⏱️ +13s
       1 suites ±0          1 💤 ±0 
       1 files   ±0          0 ❌ ±0 

Results for commit 3803954. ± Comparison against base commit b825db9.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

Merging #831 (3803954) into master (b825db9) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #831      +/-   ##
==========================================
- Coverage   96.83%   96.82%   -0.01%     
==========================================
  Files          92       92              
  Lines        6061     6055       -6     
==========================================
- Hits         5869     5863       -6     
  Misses        192      192              

Impacted Files	Coverage Δ
weldx/tags/core/geometry/spatial_data.py	94.11% <ø> (-0.89%)	⬇️
weldx/tags/core/time_series.py	96.66% <ø> (-0.31%)	⬇️

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[CagtayFabry]

thank you for pointing these out @marscher
I have left get_highest_tag_version in there for now because it might be needed for the docs build (sphinx-asdf fork)