Silent prompt when plugins fail to load in development mode (#2907)

#### What type of PR is this?
/kind improvement
/area core

#### What this PR does / why we need it:
在插件开发模式下加载插件失败时不抛出异常改为静默提示

#### Which issue(s) this PR fixes:

A part of #2901

#### Special notes for your reviewer:
how to test it?
1. 配置 `halo.plugin.fixed-plugin-path` 为一些不合法的插件项目路径不影响 Halo 正常启动，且有错误提示
2. 配置合法路径，插件能正确启动

#### Does this PR introduce a user-facing change?

```release-note
插件开发模式下无法被加载时改为静默提示不抛出异常
```

src/main/java/run/halo/app/plugin/HaloPluginManager.java

@@ -381,15 +381,9 @@ public class HaloPluginManager extends DefaultPluginManager
 
     @Override
     protected PluginWrapper loadPluginFromPath(Path pluginPath) {
-        try {
         PluginWrapper pluginWrapper = super.loadPluginFromPath(pluginPath);
         rootApplicationContext.publishEvent(new HaloPluginLoadedEvent(this, pluginWrapper));
         return pluginWrapper;
-        } catch (PluginRuntimeException e) {
-            // ignore this
-            log.warn(e.getMessage(), e);
-        }
-        return null;
     }
 
     private void removePluginComponentsCache(String pluginId) {

src/main/java/run/halo/app/plugin/PluginDevelopmentInitializer.java

@@ -1,6 +1,7 @@
 package run.halo.app.plugin;
 
 import java.nio.file.Path;
+import lombok.extern.slf4j.Slf4j;
 import org.pf4j.PluginWrapper;
 import org.springframework.boot.context.event.ApplicationReadyEvent;
 import org.springframework.context.ApplicationListener;
@@ -13,6 +14,7 @@ import run.halo.app.extension.ExtensionClient;
  * @author guqing
  * @since 2.0.0
  */
+@Slf4j
 @Component
 public class PluginDevelopmentInitializer implements ApplicationListener<ApplicationReadyEvent> {
 
@@ -43,7 +45,17 @@ public class PluginDevelopmentInitializer implements ApplicationListener<Applica
             if (idForPath(path) != null) {
                 continue;
             }
-            String pluginId = pluginManager.loadPlugin(path);
+
+            // for issue #2901
+            String pluginId;
+
+            try {
+                pluginId = pluginManager.loadPlugin(path);
+            } catch (Exception e) {
+                log.warn(e.getMessage(), e);
+                continue;
+            }
+
             PluginWrapper pluginWrapper = pluginManager.getPlugin(pluginId);
             if (pluginWrapper == null) {
                 continue;