fix(rum-explorer): assign equal weight to each CWV metric in bundle when assiging overall bundle value

[trieloff]

in the past, we would use the lowest possible consensus of all available CWV metrics, which would lead to scores look worse in aggregate than comparing each of the individual scores would imply. This change gives each present score an equal weight, so that the pre-refactoring behavior has been restored and aggregate metrics look a bit more favorable

see https://cq-dev.slack.com/archives/C07198KKQ07/p1716223820237169

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Commits

• 80743bf :white_check_mark: (latest)

[trieloff]

Alternative in #522