[Prism] Disable combiner lifting for TriggerAlways

[shunping]

Same as TriggerElementCount, TriggerAlways does not work well with combiner lifting. Therefore, we disable if there is such a trigger in the window strategy.

With this fix, the TriggerAlways integration test passed.

fixes #36145

[github-actions]

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[lostluck]

Great find. TriggerAlways can be viewed as Repeated(ElementCount=1) IIRC. I suppose the flakiness of the test is what made me miss it, as it spuriously passed.

[shunping]

TriggerAlways can be viewed as Repeated(ElementCount=1)

Brilliant! That's a good explanation of why it also failed.