Feature/add azure dev ops

[RalfvandenBurg]

Adds the Elsa.DevOps.AzureDevOps module to integrate Azure DevOps with Elsa Workflows. The implementation mirrors the structure and patterns of Elsa.DevOps.GitHub so workflows can call Azure DevOps Git, pull requests, work items, and builds from activities.
Closes #124

[greptile-apps]

Greptile Summary

Adds comprehensive Azure DevOps integration module mirroring the existing GitHub integration structure. Implements 15 activities across four categories: Git repositories/branches, pull requests, work items, and builds.

Key Changes:

• Added AzureDevOpsConnectionFactory for managing reusable VssConnection instances
• Created base AzureDevOpsActivity class with built-in validation and authentication
• Implemented activities for repositories (GetBranch, GetRepository, ListBranches)
• Implemented activities for pull requests (CreatePullRequest, GetPullRequest, ListPullRequests)
• Implemented activities for work items (CreateWorkItem, GetWorkItem, QueryWorkItems, UpdateWorkItem)
• Implemented activities for builds (GetBuild, ListBuilds, QueueBuild)
• Added comprehensive input validation helpers in ActivityInputValidation
• Registered feature with proper dependency injection

Issues Found:

• Connection factory stores PAT tokens in plain text as dictionary keys
• VssConnection instances are cached indefinitely without disposal mechanism
• Minor inefficiency in UpdateWorkItem when no fields are updated

Confidence Score: 3/5

• Safe to merge with resource management concerns that should be addressed
• The implementation is well-structured and follows existing patterns, but has resource management issues in the connection factory including storing credentials in memory and not disposing connections
• Pay close attention to AzureDevOpsConnectionFactory.cs due to credential storage and resource disposal concerns

Important Files Changed

Filename	Overview
src/modules/devops/Elsa.DevOps.AzureDevOps/Services/AzureDevOpsConnectionFactory.cs	Connection factory with PAT token storage in dictionary key and no connection disposal
src/modules/devops/Elsa.DevOps.AzureDevOps/Activities/AzureDevOpsActivity.cs	Base activity class with proper validation in CanExecuteAsync
src/modules/devops/Elsa.DevOps.AzureDevOps/Activities/PullRequests/CreatePullRequest.cs	Creates pull requests with proper validation and ref normalization
src/modules/devops/Elsa.DevOps.AzureDevOps/Activities/WorkItems/UpdateWorkItem.cs	Updates work items, creates connection twice when no changes provided
src/modules/devops/Elsa.DevOps.AzureDevOps/Features/AzureDevOpsFeature.cs	Feature registration that adds activities and registers connection factory

Class Diagram

%%{init: {'theme': 'neutral'}}%%
classDiagram
    class AzureDevOpsActivity {
        +Input~string~ OrganizationUrl
        +Input~string~ Token
        #CanExecuteAsync() ValueTask~bool~
        #GetConnection() VssConnection
    }
    
    class AzureDevOpsConnectionFactory {
        -Dictionary~string,VssConnection~ _connections
        -SemaphoreSlim _semaphore
        +GetConnection(string organizationUrl, string token) VssConnection
    }
    
    class AzureDevOpsFeature {
        +Apply() void
    }
    
    class CreatePullRequest {
        +Input~string~ Project
        +Input~string~ RepositoryName
        +Input~string~ SourceBranch
        +Input~string~ TargetBranch
        +Output~GitPullRequest~ CreatedPullRequest
    }
    
    class CreateWorkItem {
        +Input~string~ Project
        +Input~string~ WorkItemType
        +Input~string~ Title
        +Output~WorkItem~ CreatedWorkItem
    }
    
    class QueueBuild {
        +Input~string~ Project
        +Input~int~ DefinitionId
        +Output~Build~ QueuedBuild
    }
    
    class GetBranch {
        +Input~string~ Project
        +Input~string~ RepositoryName
        +Input~string~ BranchName
        +Output~GitBranchStats~ Branch
    }
    
    AzureDevOpsActivity <|-- CreatePullRequest
    AzureDevOpsActivity <|-- CreateWorkItem
    AzureDevOpsActivity <|-- QueueBuild
    AzureDevOpsActivity <|-- GetBranch
    AzureDevOpsActivity ..> AzureDevOpsConnectionFactory : uses
    AzureDevOpsFeature ..> AzureDevOpsConnectionFactory : registers
    AzureDevOpsFeature ..> AzureDevOpsActivity : discovers activities

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[greptile-apps]

_{25 files reviewed, 3 comments}

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[Namoshek]

I've a bit of experience with the Azure DevOps client libraries and the PR looks good to me. The only thing I miss is a few blank lines to make the code more readable, but I guess that's personal preference. 😉