Include eyb leads for investment projects in open search

[marijnkampf]

Description of change

Include EYB leads for investment projects in open search

Checklist

• Has this branch been rebased on top of the current main branch?

  Explanation

  The branch should not be stale or have conflicts at the time reviews are requested.

• Is the CircleCI build passing?

General points

Other things to check

• Make sure fixtures/test_data.yaml is maintained when updating models
• Consider the admin site when making changes to models
• Use select-/prefetch-related field lists in views and search apps, and update them when fields are added
• Make sure the README is updated e.g. when adding new environment variables

See docs/CONTRIBUTING.md for more guidelines.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.61%. Comparing base (aaeaea7) to head (89df725).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5840   +/-   ##
=======================================
  Coverage   96.60%   96.61%           
=======================================
  Files        1046     1046           
  Lines       24902    24904    +2     
  Branches     1647     1647           
=======================================
+ Hits        24057    24060    +3     
+ Misses        689      688    -1     
  Partials      156      156           

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[swenban]

I've left a comment around testing but I have manually tested this with the frontend and it is behaving as expected so won't block you from merging