Better visualization of paid and consent flows

[trieloff]

In explorer, we'll use the paid checkpoint instead of UTM to detect bought traffic. (see https://adobe.enterprise.slack.com/files/W5BPKRLUA/F077XV2J4JE/screenshot_2024-06-13_at_11.39.02.png)
In the sankey diagram, we use lighter colors for the no content and no interaction nodes, making them visually lighter
Sankey also shows now three ways of entering (consent shown, consent hidden, normal enter). (see https://adobe.enterprise.slack.com/files/W5BPKRLUA/F077S4128QN/screenshot_2024-06-13_at_14.20.41.png)

• feat(rum-explorer): add paid facet instead of utm facet
• feat(rum-explorer): use paid checkpoint in addition to utm checkpoint for sankey
• fix(sankey): no interaction is white, leading to less washed-out gradients
• feat(sankey): show consent/noconsent upon enter

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Commits

• 1f27cdb ✅ (latest)
• 71695c9 ✅
• 7b54ed3 ✅
• 4a9885a ✅