[build] consolidate nightly workflow #19847

Job	Run time
Check Targets / Check Targets	1m 50s
Build Index	0s
Read Targets	5s
.NET / Build / Build	14m 36s
.NET / Browser Tests / Browser Tests	13m 10s
Java	0s
Ruby	0s
Rust	0s
Python	0s
	29m 41s

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