chore: add deprecation message for export --native

[quintesse]

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[codecov]

Codecov Report

Merging #1422 (b2d6dd6) into main (5f973da) will decrease coverage by 0.00%.
The diff coverage is 60.00%.

❗ Current head b2d6dd6 differs from pull request most recent head 8427970. Consider uploading reports for the commit 8427970 to get more accurate results

@@             Coverage Diff              @@
##               main    #1422      +/-   ##
============================================
- Coverage     57.34%   57.33%   -0.01%     
- Complexity     1217     1218       +1     
============================================
  Files           104      104              
  Lines          6311     6315       +4     
  Branches       1034     1035       +1     
============================================
+ Hits           3619     3621       +2     
- Misses         2208     2209       +1     
- Partials        484      485       +1     

Flag	Coverage Δ
Linux	56.15% <60.00%> (-0.01%)	⬇️
Windows	56.73% <60.00%> (-0.01%)	⬇️

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Impacted Files	Coverage Δ
src/main/java/dev/jbang/cli/ExportMixin.java	71.42% <50.00%> (-5.05%)	⬇️
src/main/java/dev/jbang/cli/Export.java	64.33% <100.00%> (ø)

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