Remove cloudtest notifications sent to lowdev

[OneBlue]

Summary of the Pull Request

PR Checklist

• Closes: Link to issue #xxx
• Communication: I've discussed this with core contributors already. If work hasn't been agreed, this work might be rejected
• Tests: Added/updated if needed and all pass
• Localization: All end user facing strings can be localized
• Dev docs: Added/updated if needed
• Documentation updated: If checked, please file a pull request on our docs repo and link it here: #xxx

Detailed Description of the Pull Request / Additional comments

Validation Steps Performed

[Copilot]

Pull request overview

This PR updates the Azure Pipelines CloudTest job configuration to stop attributing scheduled build requests to the "lowdev" alias, aligning notifications/requester identity with the actual build requester.

Changes:

• Removed scheduleBuildRequesterAlias: "lowdev" from the CloudTestServerBuildTask inputs.
• Kept notificationSubscribers set to $(Build.RequestedForEmail) so notifications go to the requesting user.

[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated no new comments.