Feat/471 default task events refactor revert breaking changes

[bjorntore]

Looked through dfd5cff and tried to spot any breaking change of consequence.

Reverting "Success" property that was removed from UserActionResult.

Other than that I used @ivarne's tool to download all TE repos and used VS Code to search for these interfaces and classes, which have been removed in the commit:

ITaskEvents
DefaultTaskEvents
ITask
TaskBase
ConfirmationTask
DataTask
FeedbackTask
NullTask

I didn't find any usage of these in TE code.
I also checked some of the integral classes in the process engine code, without finding any.

I took a couple of the applications that had done custom stuff using the process engine (UserAction, IProcessStart, IProcessEnd) and upped the version number to https://github.com/Altinn/app-lib-dotnet/releases/tag/v8.1.0-preview.6 and built successfully.

Related Issue(s)

• Split DefaultTaskEvents in process engine into smaller interfaces and classes #471

Verification

• Your code builds clean without any errors or warnings
• Manual testing done (required)
• All tests run green

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
80.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud