feat: redirect secondary YT channels to the YTM channel

Squashed commit of the following:

commit 88809265ead6eadfafab4b74091dd1af357b9577
Author: ThetaDev <t.testboy@gmail.com>
Date:   Sat Jan 21 22:16:23 2023 +0100

    feat: redirect secondary YT channels to the YTM channel

commit 02cc120912509f40f45da243ba5d37798b9ff411
Author: ThetaDev <t.testboy@gmail.com>
Date:   Mon Jan 9 23:57:18 2023 +0100

    add artists_no_tracks testfile

src/client/response/music_artist.rs

@@ -38,6 +38,9 @@ pub(crate) struct MusicHeaderRenderer {
     pub description: Option<String>,
     #[serde(default)]
     pub thumbnail: MusicThumbnailRenderer,
+    #[serde(default)]
+    #[serde_as(as = "DefaultOnError")]
+    pub share_endpoint: Option<ShareEndpoint>,
 }
 
 #[derive(Debug, Deserialize)]
@@ -54,6 +57,18 @@ pub(crate) struct SubscriptionButtonRenderer {
     pub subscriber_count_text: String,
 }
 
+#[derive(Debug, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub(crate) struct ShareEndpoint {
+    pub share_entity_endpoint: ShareEntityEndpoint,
+}
+
+#[derive(Debug, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub(crate) struct ShareEntityEndpoint {
+    pub serialized_share_entity: String,
+}
+
 /// Response model for YouTube Music artist album page
 #[derive(Debug, Deserialize)]
 #[serde(rename_all = "camelCase")]