refactor(amazonq): reduce extra call of listAvailableCustomization (#5677)

Customization will only have "1" parent profile, so theoretically we don't need another call of listAvailableCustomization to check if the new profile has access to given profile or not. Instead, we could simply switch to default.

Author: Will-ShaoHua

plugins/amazonq/codewhisperer/jetbrains-community/src/software/aws/toolkits/jetbrains/services/codewhisperer/customization/CodeWhispererModelConfigurator.kt

@@ -90,9 +90,7 @@ class DefaultCodeWhispererModelConfigurator : CodeWhispererModelConfigurator, Pe
             QRegionProfileSelectedListener.TOPIC,
             object : QRegionProfileSelectedListener {
                 override fun onProfileSelected(project: Project, profile: QRegionProfile?) {
-                    pluginAwareExecuteOnPooledThread {
-                        CodeWhispererModelConfigurator.getInstance().listCustomizations(project, passive = true)
-                    }
+                    switchCustomization(project, null)
                 }
             }
         )

plugins/amazonq/codewhisperer/jetbrains-community/tst/software/aws/toolkits/jetbrains/services/codewhisperer/CodeWhispererModelConfiguratorTest.kt

@@ -615,7 +615,7 @@ class CodeWhispererModelConfiguratorTest {
     }
 
     @Test
-    fun `profile switch should keep using existing customization if new list still contains that arn`() {
+    fun `should switch to default customization on profile changed`() {
         val ssoConn = spy(LegacyManagedBearerSsoConnection(region = "us-east-1", startUrl = "url 1", scopes = Q_SCOPES))
         ToolkitConnectionManager.getInstance(projectRule.project).switchConnection(ssoConn)
         val oldCustomization = CodeWhispererCustomization("oldArn", "oldName", "oldDescription")
@@ -632,7 +632,7 @@ class CodeWhispererModelConfiguratorTest {
             .syncPublisher(QRegionProfileSelectedListener.TOPIC)
             .onProfileSelected(projectRule.project, null)
 
-        assertThat(sut.activeCustomization(projectRule.project)).isEqualTo(oldCustomization)
+        assertThat(sut.activeCustomization(projectRule.project)).isEqualTo(null)
     }
 
     @Test