Refactor context out of API packages (#8755)

* Refactor context out of API packages

* Update function names per feedback

* Move webhook handlers to web and fix web tests

* Move more webhook tests out of api package

* Fix static handler

web/context_test.go

@@ -0,0 +1,31 @@
+package web
+
+import (
+	"net/http"
+	"testing"
+)
+
+func TestRequireHookId(t *testing.T) {
+	c := &Context{}
+	t.Run("WhenHookIdIsValid", func(t *testing.T) {
+		c.Params = &Params{HookId: "abcdefghijklmnopqrstuvwxyz"}
+		c.RequireHookId()
+
+		if c.Err != nil {
+			t.Fatal("Hook Id is Valid. Should not have set error in context")
+		}
+	})
+
+	t.Run("WhenHookIdIsInvalid", func(t *testing.T) {
+		c.Params = &Params{HookId: "abc"}
+		c.RequireHookId()
+
+		if c.Err == nil {
+			t.Fatal("Should have set Error in context")
+		}
+
+		if c.Err.StatusCode != http.StatusBadRequest {
+			t.Fatal("Should have set status as 400")
+		}
+	})
+}