drop attribute that prevents cookies from being sent for asset request (

#8520)

## Summary

As reported by Motion, 
```
<link href="https://pri.highlight.io/assets/1079/91f4wuyZMOLJLcHQvjepfJVKYQxx1Rrv7PWSq7RJjZ8~" rel="stylesheet">
```
loads correctly from our asset cache from app.highlight.io with the
assets cookie, while
```
<link href="https://pri.highlight.io/assets/1079/_ZQLI9RtgPGhqFe1X1WDaigth52_TOp9ZNUmEenxIxY~" rel="modulepreload">
<link crossorigin="" href="https://pri.highlight.io/assets/1079/l4NeTC0Z_WRgQW7I6x9qBA22t1B6oVZk6XZFjBDgpoY~" rel="modulepreload">
```
do not load because of the `rel="modulepreload"` attribute.

We should drop the `rel` attribute as it is a performance optimization
for page load that isn't required to play back the session.

## How did you test this change?

unit testing in parse_test.go

## Are there any deployment considerations?

monitoring motion deploy

## Does this work require review from our design team?

no

backend/event-parse/parse.go

@@ -778,6 +778,9 @@ func tryGetAssetUrls(ctx context.Context, projectId int, node map[string]interfa
 		newUrl, ok := replacements[href]
 		if ok {
 			attributes["href"] = newUrl
+			if rel, ok := attributes["rel"].(string); ok && rel == "modulepreload" {
+				delete(attributes, "rel")
+			}
 		}
 		urls = append(urls, href)
 	}

backend/event-parse/parse_test.go

@@ -267,6 +267,34 @@ func TestSnapshot_ReplaceAssets(t *testing.T) {
 			}
 			assert.True(t, matched, "no asset matched %s", exp)
 		}
+
+		gotMsg, err := snapshot.Encode()
+		if err != nil {
+			t.Fatalf("error marshalling: %v", err)
+		}
+
+		var gotInterface struct {
+			Node struct {
+				ChildNodes []struct {
+					ChildNodes []struct {
+						ChildNodes []struct {
+							Id         int                    `json:"id"`
+							Attributes map[string]interface{} `json:"attributes"`
+						} `json:"childNodes"`
+					} `json:"childNodes"`
+				} `json:"childNodes"`
+			} `json:"node"`
+		}
+		err = json.Unmarshal(gotMsg, &gotInterface)
+		if err != nil {
+			t.Fatalf("error getting interface: %v", err)
+		}
+
+		assert.Equal(t, gotInterface.Node.ChildNodes[1].ChildNodes[0].ChildNodes[30].Id, 36)
+		assert.Equal(t, gotInterface.Node.ChildNodes[1].ChildNodes[0].ChildNodes[31].Id, 37)
+
+		assert.Nil(t, gotInterface.Node.ChildNodes[1].ChildNodes[0].ChildNodes[30].Attributes["rel"])
+		assert.Nil(t, gotInterface.Node.ChildNodes[1].ChildNodes[0].ChildNodes[31].Attributes["rel"])
 	})
 }
 func TestSnapshot_ReplaceAssets_Capacitor(t *testing.T) {

backend/event-parse/sample-events/input.json

@@ -233,18 +233,24 @@
 								"type": 2
 							},
 							{
+								"attributes": {
+									"href": "https://pri.highlight.io/assets/1079/l4NeTC0Z_WRgQW7I6x9qBA22t1B6oVZk6XZFjBDgpoY~",
+									"rel": "modulepreload"
+								},
+								"childNodes": [],
 								"id": 36,
-								"textContent": "\n        ",
-								"type": 3
+								"tagName": "link",
+								"type": 2
 							},
 							{
 								"attributes": {
-									"content": "Highlight gives your team full transparency into the errors, interactions, and performance metrics of your client-side application.",
-									"property": "og:description"
+									"href": "https://pri.highlight.io/assets/1079/_ZQLI9RtgPGhqFe1X1WDaigth52_TOp9ZNUmEenxIxY~",
+									"rel": "modulepreload",
+									"crossorigin": ""
 								},
 								"childNodes": [],
 								"id": 37,
-								"tagName": "meta",
+								"tagName": "link",
 								"type": 2
 							},
 							{

backend/event-parse/sample-events/output.json

@@ -231,18 +231,24 @@
 								"type": 2
 							},
 							{
+								"attributes": {
+									"href": "https://pri.highlight.io/assets/1079/l4NeTC0Z_WRgQW7I6x9qBA22t1B6oVZk6XZFjBDgpoY~",
+									"rel": "modulepreload"
+								},
+								"childNodes": [],
 								"id": 36,
-								"textContent": "\n        ",
-								"type": 3
+								"tagName": "link",
+								"type": 2
 							},
 							{
 								"attributes": {
-									"content": "Highlight gives your team full transparency into the errors, interactions, and performance metrics of your client-side application.",
-									"property": "og:description"
+									"href": "https://pri.highlight.io/assets/1079/_ZQLI9RtgPGhqFe1X1WDaigth52_TOp9ZNUmEenxIxY~",
+									"rel": "modulepreload",
+									"crossorigin": ""
 								},
 								"childNodes": [],
 								"id": 37,
-								"tagName": "meta",
+								"tagName": "link",
 								"type": 2
 							},
 							{