Chore: Refactor api handlers to use web.Bind (#42199)

* Chore: Refactor api handlers to use web.Bind

* fix comments

* fix comment

* trying to fix most of the tests and force routing.Wrap type check

* fix library panels tests

* fix frontend logging tests

* allow passing nil as a response to skip writing

* return nil instead of the response

* rewrite login handler function types

* remove handlerFuncCtx

* make linter happy

* remove old bindings from the libraryelements

* restore comments

pkg/services/libraryelements/libraryelements_test.go

@@ -1,8 +1,10 @@
 package libraryelements
 
 import (
+	"bytes"
 	"context"
 	"encoding/json"
+	"io"
 	"net/http"
 	"testing"
 	"time"
@@ -68,7 +70,8 @@ func TestDeleteLibraryPanelsInFolder(t *testing.T) {
 	scenarioWithPanel(t, "When an admin tries to delete a folder that contains disconnected elements, it should delete all disconnected elements too",
 		func(t *testing.T, sc scenarioContext) {
 			command := getCreateVariableCommand(sc.folder.Id, "query0")
-			resp := sc.service.createHandler(sc.reqContext, command)
+			sc.reqContext.Req.Body = mockRequestBody(command)
+			resp := sc.service.createHandler(sc.reqContext)
 			require.Equal(t, 200, resp.Status())
 
 			resp = sc.service.getAllHandler(sc.reqContext)
@@ -266,7 +269,8 @@ func scenarioWithPanel(t *testing.T, desc string, fn func(t *testing.T, sc scena
 
 	testScenario(t, desc, func(t *testing.T, sc scenarioContext) {
 		command := getCreatePanelCommand(sc.folder.Id, "Text - Library Panel")
-		resp := sc.service.createHandler(sc.reqContext, command)
+		sc.reqContext.Req.Body = mockRequestBody(command)
+		resp := sc.service.createHandler(sc.reqContext)
 		sc.initialResult = validateAndUnMarshalResponse(t, resp)
 
 		fn(t, sc)
@@ -333,3 +337,8 @@ func getCompareOptions() []cmp.Option {
 		}),
 	}
 }
+
+func mockRequestBody(v interface{}) io.ReadCloser {
+	b, _ := json.Marshal(v)
+	return io.NopCloser(bytes.NewReader(b))
+}