Add more helper methods for settings result on Activity

[AndreyTretyak]

Currently, activity has extension methods https://github.com/microsoft/Omex/blob/a6ac88ec960000bc14562fa2215a7bbb8b486140/src/Extensions/Abstractions/Activities/ActivityExtensions.cs#L60

It looks like they are using a lot, so it would be nice to have additions methods to simplify interactions, for example:

public static Activity MarkAsSuccess(this Activity activity) { ... }
public static Activity MarkAsSystemError(this Activity activity) { ... }
public static Activity MarkAsExpectedError(this Activity activity) { ... }

They would be calling SetResult inside, also some simple unit tests needed for it.

[MatusTomko]

i want to do this isssue

[MatusTomko]

@AndreyTretyak how can i push my changes there?

[AndreyTretyak]

@MatusTomko you need to

1. fork a repository
2. Then you would be able to push your local branch to the forked repository (if you already have a branch in your local copy you can just replace the URL of the remote or add a second remote to push). https://docs.github.com/en/free-pro-team@latest/github/using-git/changing-a-remotes-url
3. Then you can use GitHub UI to create a pull request from a branch in your fork into the master of this repository. https://docs.github.com/en/free-pro-team@latest/github/collaborating-with-issues-and-pull-requests/creating-a-pull-request

Please let me know if you would have problems with any of the steps.

[MatusTomko]

@AndreyTretyak I have a problem with Perform CodeQL Analysis, do you know what is problem?

[AndreyTretyak]

@MatusTomko I think it was intermittent (that build stage not required), I've restarted pipelines and it looks successful now.