Add linux_mesh_shell example to ports tests #2055

Job	Run time
Build GCC test target (ubuntu-latest, 9-2020-q2)	3m 3s
Build GCC test target (ubuntu-latest, 13.2.Rel1)	2m 48s
Build GCC test target (ubuntu-latest, 10.3-2021.10)	2m 48s
Build GCC test target (ubuntu-latest, 14.2.Rel1)	2m 34s
Build GCC test target (ubuntu-latest, 11.3.Rel1)	2m 54s
Build GCC test target (ubuntu-latest, 8-2019-q3)	3m 45s
Build GCC test target (ubuntu-latest, 15.2.Rel1)	2m 44s
Build GCC test target (ubuntu-latest, 12.2.Rel1)	2m 47s
	23m 23s

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