Add support for reportMetric message from CSS

[CrisBarreiro]

Task/Issue URL: https://app.asana.com/1/137249556945/project/45878998844068/task/1210462957793120?focus=true

Warning
Before merging this PR, we should first merge duckduckgo/content-scope-scripts#1766 and update CSS version on the app

Description

Fire pixel when reportMetric message comes from CSS

Steps to test this PR

Feature 1

• Apply this patch to update CSS version and enable forcing the error on the Duck Player page
• Load any video on Duck Player, edit the URL appending ?willThrow=true and load again
• Check duckplayer_js-error with params: {message=Simulated Exception, kind=Error, origin=duckPlayerPage} {} is fired

[CrisBarreiro]

• Add support for reportMetric message from CSS #6397 👈 (View in Graphite)
• develop

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[marcosholgado]

IMO we are leaking by default a lot of implementation details and using DuckPlayerPageHandler as a bypass rather than extracting messages to their own handler. Then all these messages have a meaningless trip around the tab fragment, view model, js helper, etc.
This is a perfect example of that, you could do something like this instead which will keep all the logic in impl (I would actually do an internal plugin just for duck player to not have a lot of inner classes and sort out DI but this works for now anyways).

inner class DuckPlayerReportMetricHandler(private val pixel: Pixel) : JsMessageHandler {
        override fun process(jsMessage: JsMessage, secret: String, jsMessageCallback: JsMessageCallback?) {
            try {
                val params = jsMessage.params
                val message = params.getString("message") ?: return
                val kind = params.getString("kind") ?: return
                pixel.fire(
                    DUCK_PLAYER_JS_ERROR,
                    mapOf("message" to message, "kind" to kind, "origin" to featureName),
                )
            } catch (e: Exception) {
                logcat { "Error reporting metric: $e" }
            }
        }

        override val allowedDomains: List<String> = listOf(
            runBlocking { duckPlayer.getYouTubeEmbedUrl() },
        )
        override val featureName: String = "duckPlayerPage"
        override val methods: List<String> = listOf(
            "reportMetric",
        )
    }