Add a way to make a marker field used for the tooltipLabel searchable without showing it twice in the tooltip

Example profile: https://share.firefox.dev/3Q6SOCC

The `marker.data.phase` values are not searchable. Currently the only way to make them searchable is to add an extra line in all tooltips by adding a searchable field.

Ideas to fix this:
- Make all the data fields used in `tooltipLabel`, `tableLabel` or `chartLabel` automatically searchable. (not sure how much overhead that would add)
- Add a `hidden` prop to use in the data array of the marker schema.

┆Issue is synchronized with this [Jira Task](https://mozilla-hub.atlassian.net/browse/FP-27)