💫 [IMPR] Add participant counts to Touristic Events exports

[Chatewgne]

Description

Related Issue

Checklist

• I have followed the guidelines in our Contributing document
• My code respects the Definition of done available in the Development section of the documentation
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works.
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[cypress]

Geotrek-admin    Run #10891

Run Properties:   Passed #10891  •  6b1bdcfc56 ℹ️: Merge 1f67497b541df10db19e283f0ba4313c53a1b6bc into 8df192f4a74f0b402ee06a752d30...

Project	Geotrek-admin
Branch Review	refs/pull/4471/merge
Run status	Passed #10891
Run duration	02m 03s
Commit	6b1bdcfc56 ℹ️: Merge 1f67497b541df10db19e283f0ba4313c53a1b6bc into 8df192f4a74f0b402ee06a752d30...
Committer	Célia
View all properties for this run ↗︎

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Test results
Failures	0
Flaky	0
Pending	0
Skipped	0
Passing	22
View all changes introduced in this branch ↗︎