Adjust MTP detection

[Youssef1313]

Context

Describe the context or motivation for this PR. Include links to any related Azure DevOps Work Items or GitHub issues.
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Depends on dotnet/sdk#50673

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Task Name

DotNetCoreCLI

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Description

In past, we added support for dotnet.config (this was shipped during .NET 10 previews, and will be shipped in RC1 as well).

However, starting from RC2 (if the dotnet/sdk PR above is merged), we will be dropping dotnet.config completely, and switching to global.json. This PR updates the DotNetCoreCLI task to read global.json instead of dotnet.config.

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Risk Assessment (Low / Medium / High)

Low. This is a .NET 10 feature that didn't yet ship in GA and has very low number of users.

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Change Behind Feature Flag (Yes / No)

Can this change be behind feature flag, if not why?

There is already a feature flag in this code path.

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Tech Design / Approach

Instead of parsing dotnet.config as TOML, we parse now global.json.

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Documentation Changes Required (Yes/No)

Indicate whether related documentation needs to be updated.

• User guides, API specs, system diagrams, or runbooks are updated.

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Unit Tests Added or Updated (Yes / No)

Indicate whether unit tests were added or modified to reflect these changes.

Tested manually.

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Additional Testing Performed

List all other tests performed (manual or automated, including integration, regression, scenario tests, etc.).

Tested manually.

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Logging Added/Updated (Yes/No)

Debug logging is added.

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Telemetry Added/Updated (Yes/No)

No

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Rollback Scenario and Process (Yes/No)

No

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Dependency Impact Assessed and Regression Tested (Yes/No)

• All impacted internal modules, APIs, services, and third-party libraries are analyzed.
• Results are reviewed and confirmed to not break existing functionality.

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Checklist

• Related issue linked (if applicable)
• Task version was bumped — see versioning guide
• Verified the task behaves as expected

[Youssef1313]

This change was manually tested using the following steps:

• Updating task.json to change the ID to a new random Guid, and update the name to be "MyDotNetCoreCLI" to not clash with the original DotNetCoreCLI.
• Build locally with node make.js build –-task DotNetCoreCLIV2 (NOTE: --task is broken today, I hacked around it and hardcoded the task name in the script)
• tfx login (the access token needs to have Marketplace: Publish and Agent Pools: Read & Manage)
• tfx build tasks upload --task-path "<repo-root>\_build\Tasks\DotNetCoreCLIV2"
• In a repo to test, use the task MyDotNetCoreCLI in YML.

[tarunramsinghani]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 3 pipeline(s).

[tarunramsinghani]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 3 pipeline(s).

[tarunramsinghani]

Closing this PR as this is replaced with a local branch PR @ #21315