Deprecated API usages in the plugin should be replaced with stable API calls

[Vassiliy-Kudryashov]

Description

There is a list of deprecated API usages and some internal API calls (https://plugins.jetbrains.com/plugin/19445-unittestbot/versions):

1. Internal method Module.getModuleFile() is invoked in ModuleUtilsKt.addDedicatedTestRoot(Module, List) FIXED

Update: because of for backward compatibility requirement (we need it for AndroidStudio) following API usages should be migrated later. All suggested fixes for following ussies are actual for API 2020.3+ but the plugin should be compatible with 2020.2 as well:

2. Deprecated method NotificationGroup.createNotification(...) is invoked in UrlNotifier.notify(String, Project, Module)
3. Deprecated method Row.setCellMode(boolean, boolean, boolean) is invoked in UiUtilsKt.labeled$1.invoke(Row)
4. Deprecated method RefactoringUtil.createPackageDirectoryInSourceRoot(...) is invoked in GenerateTestsDialogWindow.createSelectedPackage$.inlined.runWriteAction$1.compute()
5. Deprecated method Project.getBaseDir() is invoked in TestFolderComboWithBrowseButton.formatUrl(...)
6. Deprecated method Messages.showYesNoDialog(...) is invoked in GenerateTestsDialogWindow.createKotlinJvmTargetNotificationDialog()
7. Deprecated class ComboboxWithBrowseButton is referenced in TestFolderComboWithBrowseButton
8. Deprecated constructor NotificationGroup.(...) is invoked in Notifier.getNotificationGroup()
9. Deprecated interface DialogWrapper.DoNotAskOption is referenced in GenerateTestsDialogWindow.createKotlinJvmTargetNotificationDialog()
10. Configuration file 'withAndroid.xml' for optional dependency 'org.jetbrains.android' is invalid: Invalid plugin descriptor 'withAndroid.xml': Unable to read plugin descriptor~~

We should get rid of these warnings and use stable/recommended API where it's possible (or write own methods with similar functionality if need)