[release/9.0] Move default build images to macos 15 (and xcode 16) (#120589)

[agocke]

(cherry picked from commit eaafd7c) (cherry picked from commit 1905046)

[Copilot]

Pull request overview

This pull request updates the default macOS build environment from macOS 13 to macOS 15 (which includes Xcode 16), focusing primarily on the public build pool infrastructure. The change also excludes two Swift interop stress tests that are failing in the new environment.

Key Changes

• Updated OSX Public Build Pool vmImage from 'macos-13' to 'macos-15'
• Added explanatory comment about maintaining latest build platform versions
• Excluded Swift interop stress tests for mono minijit x64 configuration due to known issues

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
eng/pipelines/common/xplat-setup.yml	Updated public macOS build pool from macOS 13 to macOS 15 and added comment documenting version policy
src/tests/issues.targets	Added exclusions for SwiftRetAbiStress and SwiftCallbackAbiStress tests under mono minijit x64 configuration

Comments suppressed due to low confidence (1)

eng/pipelines/common/xplat-setup.yml:181

• The comment states "We should always be building on the latest available version of our build platform" and requires "a tracking issue if the latest version does not work for some reason." However, the OSX Internal Pool (line 181) still uses 'macOS-13' while the OSX Public Build Pool (line 176) has been updated to 'macos-15'. This inconsistency means the comment's requirement is not being met. Either update the OSX Internal Pool to 'macos-15' or add a comment with a tracking issue explaining why it cannot use the latest version.

      # N.B.: We should always be building on the latest available version of our build platform.
      # Each of these queues should be the latest version or have a tracking issue if the latest version
      # does not work for some reason.
      pool:
        # Public Linux Build Pool
        ${{ if and(or(in(parameters.osGroup, 'linux', 'freebsd', 'android', 'tizen'), eq(parameters.jobParameters.hostedOs, 'linux')), eq(variables['System.TeamProject'], 'public')) }}:
          name:  $(DncEngPublicBuildPool)
          demands: ImageOverride -equals Build.Ubuntu.2204.Amd64.Open

        # Official Build Linux Pool
        ${{ if and(or(in(parameters.osGroup, 'linux', 'freebsd', 'android', 'tizen'), eq(parameters.jobParameters.hostedOs, 'linux')), ne(variables['System.TeamProject'], 'public')) }}:
          name: $(DncEngInternalBuildPool)
          demands: ImageOverride -equals 1es-ubuntu-2204
          os: linux

        # OSX Public Build Pool (we don't have on-prem OSX BuildPool).
        ${{ if and(in(parameters.osGroup, 'osx', 'maccatalyst', 'ios', 'iossimulator', 'tvos', 'tvossimulator'), eq(variables['System.TeamProject'], 'public')) }}:
          vmImage: 'macos-15'

        # OSX Internal Pool
        ${{ if and(in(parameters.osGroup, 'osx', 'maccatalyst', 'ios', 'iossimulator', 'tvos', 'tvossimulator'), ne(variables['System.TeamProject'], 'public')) }}:
          name: "Azure Pipelines"
          vmImage: 'macOS-13'

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