Fix: case-insensitive name matching and indexing for vocab metadata

[ehennestad]

Remove struct concatenation, not guaranteed that the types vocab is homogeneous

[github-actions]

Test Results (R2021b)

568 tests  ±0   568 ✅ ±0   1m 33s ⏱️ +2s
 16 suites ±0     0 💤 ±0 
  1 files   ±0     0 ❌ ±0 

Results for commit b680b06. ± Comparison against base commit efd54e2.

[github-actions]

Test Results (R2024b)

568 tests  ±0   568 ✅ ±0   1m 30s ⏱️ ±0s
 16 suites ±0     0 💤 ±0 
  1 files   ±0     0 ❌ ±0 

Results for commit b680b06. ± Comparison against base commit efd54e2.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.80%. Comparing base (efd54e2) to head (b680b06).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...ernal/+openminds/+internal/+vocab/getSchemaColor.m	0.00%	3 Missing ⚠️
...penminds/+internal/+vocab/getSchemaLabelFromName.m	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #86      +/-   ##
==========================================
+ Coverage   75.78%   75.80%   +0.02%     
==========================================
  Files         349      349              
  Lines        3741     3740       -1     
==========================================
  Hits         2835     2835              
+ Misses        906      905       -1     

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