Remove anchors/hashes in Snowplow events URLs

Related to #338320 (closed)

The reasoning behind this being that there might be PII contained in this string, that's mostly generated automatically.

Examples
gitlab.com/namespace:4/project:2/-/wikis/My-Wiki#my-section
gitlab.com/namespace:4/-/issues/123#note_123
gitlab.com/namespace:4/project:2/-/edit#js-general-settings
gitlab.com/namespace:4/project:2/-/merge_requests/133/diffs#bffabf2f6e5fbbc42e0ec64dc79fc40e4387b425
gitlab.com/projects/new#import_project
gitlab.com/namespace:4/project:2/-/usage_quotas#seats-quota-tab
gitlab.com/namespace:4/project:2/-/releases#5.2.1

Note that this is only for gitlab.com, the Handbook's links tracking hashes would be added as usual ( about.gitlab.com/handbook/pages/my-page#my-section for example).