[CQ] remove unneccessary imports (flutter#8103)

Opportunistic cleanup.

---

- [x] I’ve reviewed the contributor guide and applied the relevant
portions to this PR.

Author: pq

flutter-idea/src/io/flutter/run/FlutterConfigurationEditorForm.java

@@ -6,7 +6,6 @@
 package io.flutter.run;
 
 import com.intellij.execution.configuration.EnvironmentVariablesTextFieldWithBrowseButton;
-import com.intellij.openapi.options.ConfigurationException;
 import com.intellij.openapi.options.SettingsEditor;
 import com.intellij.openapi.project.Project;
 import com.intellij.openapi.ui.TextFieldWithBrowseButton;

flutter-idea/src/io/flutter/run/SdkAttachConfig.java

@@ -25,8 +25,6 @@
 import com.intellij.openapi.module.ModuleUtilCore;
 import com.intellij.openapi.options.SettingsEditor;
 import com.intellij.openapi.project.Project;
-import com.intellij.openapi.util.Disposer;
-import com.intellij.openapi.util.text.StringUtil;
 import com.intellij.psi.PsiElement;
 import com.intellij.refactoring.listeners.RefactoringElementListener;
 import com.jetbrains.lang.dart.sdk.DartConfigurable;
@@ -35,8 +33,6 @@
 import io.flutter.dart.DartPlugin;
 import io.flutter.pub.PubRoot;
 import io.flutter.run.common.RunMode;
-import io.flutter.run.daemon.FlutterApp;
-import io.flutter.sdk.FlutterSdkManager;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 

flutter-idea/src/io/flutter/run/SdkRunConfig.java

@@ -15,7 +15,6 @@
 import com.intellij.execution.filters.UrlFilter;
 import com.intellij.execution.runners.ExecutionEnvironment;
 import com.intellij.execution.runners.RunConfigurationWithSuppressedDefaultRunAction;
-import com.intellij.openapi.application.ModalityState;
 import com.intellij.openapi.application.ReadAction;
 import com.intellij.openapi.diagnostic.Logger;
 import com.intellij.openapi.module.Module;

flutter-idea/src/io/flutter/run/bazel/FlutterBazelConfigurationEditorForm.java

@@ -7,7 +7,6 @@
 
 import com.intellij.openapi.fileChooser.FileChooserDescriptor;
 import com.intellij.openapi.fileChooser.FileChooserDescriptorFactory;
-import com.intellij.openapi.options.ConfigurationException;
 import com.intellij.openapi.options.SettingsEditor;
 import com.intellij.openapi.project.Project;
 import com.intellij.openapi.ui.TextFieldWithBrowseButton;

flutter-idea/src/io/flutter/run/coverage/FlutterCoverageProgramRunner.java

@@ -8,7 +8,6 @@
 import com.intellij.coverage.CoverageDataManager;
 import com.intellij.coverage.CoverageExecutor;
 import com.intellij.coverage.CoverageRunnerData;
-import com.intellij.execution.ExecutionException;
 import com.intellij.execution.configurations.ConfigurationInfoProvider;
 import com.intellij.execution.configurations.RunProfile;
 import com.intellij.execution.configurations.RunProfileState;

flutter-idea/src/io/flutter/run/test/TestForm.java

@@ -6,7 +6,6 @@
 package io.flutter.run.test;
 
 import com.intellij.openapi.fileChooser.FileChooserDescriptorFactory;
-import com.intellij.openapi.options.ConfigurationException;
 import com.intellij.openapi.options.SettingsEditor;
 import com.intellij.openapi.project.Project;
 import com.intellij.openapi.ui.TextFieldWithBrowseButton;