Highlight search terms in RemoteSelect

[tvdeyen]

What is this pull request for?

Makes it more obvious why a entry is in the list and complies to the default highlighting that select2 does if there is no html template rendering function.

Checklist

• [x] I have followed Pull Request guidelines
• [x] I have added a detailed description into each commit message

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.96%. Comparing base (98293af) to head (01bd3e9).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2898 +/- ## ======================================= Coverage 95.96% 95.96% ======================================= Files 230 230 Lines 6269 6269 ======================================= Hits 6016 6016 Misses 253 253 ```

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