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I also had to create a ticket for Microsoft to look into this. The product team has said the feature has been removed from Purview and notice wasn't given because its not a breaking change Copy of the email below
After reviewing the issue in depth, I’d like to sincerely apologize for the confusion and any inconvenience this may have caused. There is no Message Center ID announcing a deprecation or removal of the browseToUrl activity, because Microsoft has not classified this as a breaking change. What has happened instead is a silent signal consolidation along with user‑experience changes in Activity Explorer. As part of this transition, the browseToUrl activity is no longer surfaced explicitly for many tenants. This means the data is still captured through broader browser‑signal categories, but the specific activity label no longer appears in the interface.