Make createJiraTaskIntegration/createGitHubTaskIntegration generic

[Dschoordsch]

Both mutations are virtually identical and are just different in the IntegrationManage used. Since we also need a mutation like this for Jira Server and GitLab it is sensible to make it generic first

Acceptance criteria

• replace createJiraTaskIntegration and createGitHubTaskIntegration with one createTaskIntegration mutation
  • arguments integration of type IntegrationProviderTypeEnum, taskId and projectId
• all integration specific actions are performed in their respective IntegrationManager

[Dschoordsch]

The idea is to have 2 arguments: taskId is our id, projectId is integration specific and interpreted by the integration manager. For Jira the projectId would be in the format JiraProjectId which already includes the cloudId and projectKey, for GitHub the projectId would be in the format nameWithOwner which is just GitHubs format for a project id.

[elielytz]

Testing results

This works like a charm 💯 .