Move link_t_rad_t_electron to config file

[sonachitchyan]

Moved link_t_rad_t_electron from being defined in standard_plasmas.py to plasma.yml in io/schemas
Description

Motivation and context

How has this been tested?

• Testing pipeline
• Other

Examples

Type of change

• Bug fix
• New feature
• Breaking change
• None of the above

Checklist

• I have updated the documentation according to my changes
• I have built the documentation by applying the build_docs label to this pull request (if you don't have enough privileges a reviewer will do it for you)
• I have requested two reviewers for this pull request

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[codecov]

Codecov Report

Merging #2008 (12dde85) into master (1133636) will increase coverage by 0.01%.
The diff coverage is 100.00%.

❗ Current head 12dde85 differs from pull request most recent head 192f28c. Consider uploading reports for the commit 192f28c to get more accurate results

@@            Coverage Diff             @@
##           master    #2008      +/-   ##
==========================================
+ Coverage   59.99%   60.01%   +0.01%     
==========================================
  Files          70       70              
  Lines        8112     8115       +3     
==========================================
+ Hits         4867     4870       +3     
  Misses       3245     3245              

Impacted Files	Coverage Δ
tardis/plasma/standard_plasmas.py	74.48% <ø> (ø)
tardis/io/atom_data/base.py	89.71% <100.00%> (+0.17%)	⬆️

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[Rodot-]

Looks good to me

[chvogl]

Looks good.