Directly enumerate requests when scheduling one.

[Erarndt]

Fixes #

Context

Changes Made

Testing

Notes

[Copilot]

Pull Request Overview

This PR streamlines the scheduling process by directly enumerating unscheduled requests instead of first copying them into a new list.

• Eliminates the intermediate List allocation for unscheduled requests
• Directly iterates over _schedulingData.UnscheduledRequestsWhichCanBeScheduled in the scheduler component

Comments suppressed due to low confidence (1)

src/Build/BackEnd/Components/Scheduler/Scheduler.cs:994

• Directly iterating over _schedulingData.UnscheduledRequestsWhichCanBeScheduled removes the defensive copy previously used to avoid potential issues if the collection is modified during iteration. Please verify that the collection remains unmodified during enumeration or consider retaining a copy if concurrent modifications are possible.

foreach (SchedulableRequest request in _schedulingData.UnscheduledRequestsWhichCanBeScheduled)