[openstreetmap/openstreetmap-website] Make contribution heat map opt in (Issue #5804)

[Michael]

Discostu36 created an issue (openstreetmap/openstreetmap-website#5804)

### Problem

There have been several critical comments about the new contribution heat map feature. Some users see the publication of their contribution patterns as a violation of their privacy or even a breach of GDPR.

Some of the discussions can be found here:
- https://community.openstreetmap.org/t/umfrage-aktivitatskalender-auf-jeder-osm-user-seite/127294
- https://en.osm.town/@osm_tech/114160805593628586

### Description

Make this feature opt-in. Users need to activate it in their preferences for the heat map to be displayed.

### Screenshots

_No response_

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