feat(tools/mcp): add dry_run flag to submit_job #8432

Job	Run time
check-file-changes	11s
check-dco / wait	23s
linux	8m 5s
mcp	17s
launcher	28s
skills	8s
windows	7m 15s
partial-install (torch)	4m 10s
partial-install (onnx)	2m 9s
multi-version (unit-3.13(torch_212, tf_latest), 3.13)	5m 17s
multi-version (unit-3.12(torch_210, tf_latest), 3.12)	6m 16s
multi-version (unit-3.12(torch_29, tf_latest), 3.12)	5m 27s
multi-version (unit-3.12(torch_28, tf_latest), 3.12)	5m 16s
multi-version (unit-3.10(torch_212, tf_latest), 3.10)	5m 47s
multi-version (unit-3.12(torch_211, tf_latest), 3.12)	5m 17s
multi-version (unit-3.11(torch_212, tf_latest), 3.11)	4m 56s
multi-version (unit-3.14(torch_212, tf_latest), 3.14)	5m 50s
multi-version (unit-3.12(torch_212, tf_min), 3.12)	5m 8s
unit-pr-required-check	3s
	1h 12m 23s

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