[installer] remove FluentD support

[atoulme]

Description:
Remove FluentD support from the bash standalone installer.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 33.24%. Comparing base (d8feb99) to head (adf9b2b).
⚠️ Report is 16 commits behind head on main.

❌ Your project check has failed because the head coverage (33.24%) is below the target coverage (35.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7123      +/-   ##
==========================================
- Coverage   39.92%   33.24%   -6.68%     
==========================================
  Files         335      330       -5     
  Lines       23334    23318      -16     
==========================================
- Hits         9317     7753    -1564     
- Misses      13257    14671    +1414     
- Partials      760      894     +134     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.