Only report CLS when FCP is reported #154
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This PR updates the work done in #149 to only report CLS if the page also reported FCP.
The downside of this change is measuring CLS now includes a dependency on the FCP logic (even for developers not monitoring FCP directly). The benefit, though, is that it better aligns with the current behavior of CrUX.
The goal of this library is to align with CrUX as much as possible, so the additional dependency is necessary to achieve the best alignment.