Build "Windows Local Development" job in official builds

[wtgodbe]

Allows us to build our templates in the internal project, so that they can be tracked by CG. Fixes #61518.

Test build: https://dev.azure.com/dnceng/internal/_build/results?buildId=2688844&view=results

[dotnet-policy-service]

Hey @dotnet/aspnet-build, looks like this PR is something you want to take a look at.

[Copilot]

Pull Request Overview

This PR adds a new Windows Local Development job to the official builds to enable building templates in the internal project and tracking them via CG. The key changes include updating the build step to use a PowerShell script instead of a CMD script and adding additional build parameters.

• Replaces build.cmd with build.ps1 and adds the "-WarnAsError:false" flag.
• Adds the "-bl" argument to the test execution block.

Comments suppressed due to low confidence (2)

.azure/pipelines/ci.yml:661

• [nitpick] The purpose of the '-bl' flag is not immediately clear. Consider adding an inline comment or using a more descriptive flag name to clarify its intent.

                      -bl

.azure/pipelines/ci.yml:647

• The new build step uses a PowerShell script with a quoted argument '-WarnAsError:false'. Please verify that the quotes are required and that the script correctly interprets the flag. If the script expects a boolean value, consider passing it without quotes or using an assignment format (for example, -WarnAsError=$false).

            - powershell: ./eng/build.ps1 -all -noBuildJava -noBuildNodeJS "-WarnAsError:false"