MM-18281 Refactor "app/server_app_adapters.go" to use structured logging (#12503)

* chore: refactor to use structured logging

 - remove the unsed fmt package
 - convert the fmt.sprintt to the structured logging

* implement requested changes from iomodo

* implement feedback from willfrog

app/server_app_adapters.go

@@ -4,7 +4,6 @@
 package app
 
 import (
-	"fmt"
 	"net/http"
 	"net/url"
 	"path"
@@ -67,7 +66,7 @@ func (s *Server) RunOldAppInitalization() error {
 	}
 
 	if htmlTemplateWatcher, err := utils.NewHTMLTemplateWatcher("templates"); err != nil {
-		mlog.Error(fmt.Sprintf("Failed to parse server templates %v", err))
+		mlog.Error("Failed to parse server templates", mlog.Err(err))
 	} else {
 		s.FakeApp().Srv.htmlTemplateWatcher = htmlTemplateWatcher
 	}
@@ -131,7 +130,7 @@ func (s *Server) RunOldAppInitalization() error {
 		appErr = backend.TestConnection()
 	}
 	if appErr != nil {
-		mlog.Error("Problem with file storage settings: " + appErr.Error())
+		mlog.Error("Problem with file storage settings", mlog.Err(appErr))
 	}
 
 	if model.BuildEnterpriseReady == "true" {