Added site setting: "userId linked to visitorId" #13620
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Added a new setting "userId linked to visitorId" (default: enabled), that allows to turn off the default "userId overrides visitorId" behaviour as a per-site setting.
This is useful for example when using the third party cookie, and thus all Matomo sites use the same "global" visitorId for the same device, and some Matomo sites set a userid. In this case, once a site sets a userid, the vistiorId will change and make it impossible to follow a visitor when traveling through different matomo sites.
With this setting, this behavior can be adjusted. userId and visitiorId will no longer influence each other when the new setting is disabled.
However, different devices with the same userId will also no longer share the same visit and visitorId.