[release/5.0] Avoid including the validation stage if not necessary (#6376) #6467
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Description
This removes the Validation stage if both of these conditions are false:
Every job dependency transition has a pretty decent cost. The stage typically takes a minute or so, and also requires getting a machine, etc. This adds up
Customer Impact
Build times stay the same
Regression
No
Risk
Low. Been working master for quite a while
Workarounds
None