Search: Toggle behavioural analytics

[wei2912]

See https://www.elastic.co/guide/en/elasticsearch/reference/8.17/behavioral-analytics-start.html.

This is in beta but GPDR-compliant so we should just add it in.

[linear]

MPT-142 Search: Toggle behavioural analytics

[wei2912]

UI integration should use the JavaScript tracker. I've also created collections named development and production, to be used accordingly (see

mentorship-page/src/components/ResultViewGrid.tsx

Line 33 in 937b32f

window.umami.track("Impression", { id, env: process.env.NODE_ENV });

for an example of how to check if we're in development or production).