fix: properly set string values in exports to escape formulas

[susnux]

• follow up on fix: quote cell values to prevent formula evaluation #2674

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 45.46%. Comparing base (3adb419) to head (b949dab).
Report is 19 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2772      +/-   ##
============================================
- Coverage     45.48%   45.46%   -0.02%     
  Complexity      987      987              
============================================
  Files            79       79              
  Lines          3586     3587       +1     
============================================
  Hits           1631     1631              
- Misses         1955     1956       +1     

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[susnux]

/backport to stable5

[susnux]

/backport to stable4

[Chartman123]

/backport to stable4

Stable4 is already out of support and has a branch protection in place.