Revert back to skipping test test_rft_csv_export_plugin_exports_rft_data

[DanSava]

Issue
Skip test_rft_csv_export_plugin_exports_rft_data to avoid
https://github.com/equinor/ert/actions/runs/6246220951/job/16958563596?pr=6119
while working on actual fix

Pre review checklist

• Read through the code changes carefully after finishing work
• Make sure tests pass locally (after every commit!)
• Prepare changes in small commits for more convenient review (optional)
• PR title captures the intent of the changes, and is fitting for release notes.
• Updated documentation
• Ensured that unit tests are added for all new behavior (See
  Ground Rules),
  and changes to existing code have good test coverage.

Pre merge checklist

• Added appropriate release note label
• Commit history is consistent and clean, in line with the contribution guidelines.

[codecov-commenter]

Codecov Report

Merging #6121 (d1e213a) into main (c1ab4e6) will decrease coverage by 0.03%.
Report is 1 commits behind head on main.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #6121      +/-   ##
==========================================
- Coverage   82.48%   82.45%   -0.03%     
==========================================
  Files         350      350              
  Lines       21442    21442              
  Branches      834      834              
==========================================
- Hits        17687    17681       -6     
- Misses       3457     3463       +6     
  Partials      298      298              

see 3 files with indirect coverage changes

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