Add Ubuntu 26.04 arm64 platform configurations


Tests are set as insignificant.

Pick-to: 6.12
Task-number: QTQAINFRA-8002
Change-Id: I71872abc8254650aaa59a0a61065667b61a98fa4
Reviewed-by: Liang Qi <liang.qi@qt.io>
commit5ad8a505026a28bf617a086a2d47c6c62428e6dd
parent924e26cc1a9be95742e8eadc2cb41f0213cd7023
authorElias Toivola <elias.toivola@qt.io>
committerElias Toivola <elias.toivola@qt.io>
commit timeWed, 7 Oct 2026 06:06:35 +0000