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[WIP] Fix failing GitHub Actions job 'Unit tests (A-C)' (#56345)

* Initial plan

* Pin default MCP container images

Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>
Co-authored-by: Don Syme <dsyme@users.noreply.github.com>
C
Copilot committed
81501f385dabf4e329b606d18680407931bc5ced
Parent: 8155453
Committed by GitHub <noreply@github.com> on 8/27/2026, 2:31:15 PM