fix: constraint containerType outboundnode boundary. Fixes #12997

[tczhao]

Fixes #12997

Motivation

Root cause:
say we have dag

task: A(containerset)
task: B(containerset), depends: A
task: C(containerset), depends: A

if task B is processed and started before the controller can process C,
C will find the deepest node in A without considering boundaries and mistakenly attach to B

Modifications

if a node(containerType) child node do not have the same boundyID, we return the current node as the deepest outbound node.

Verification

Tested:
Before code change

• ran the workflow from the issue ticket, failed: incorrect dependency and controller panic
• ran new unit test without change, failed as expected

After code change

• ran the workflow from the issue ticket, succeeded with the correct dependencies
• ran unit test with the code change, succeed

[agilgur5]

Merging as this has been approved and has no conflicts & passes tests.