Use an efficient representation for merged components of operations #19909

Job	Run time
Misc check	4s
Packaging test	1m 22s
Type check	1m 22s
Doc test	1m 43s
Notebook formatting	14s
Format check	18s
Changed files test	2m 15s
Coverage check	18m 32s
Build protos	17s
Lint check	2m 34s
Shell check	7s
Pytest Ubuntu (3.12)	11m 5s
Pytest Ubuntu (3.11)	8m 52s
Pytest Windows (3.13)	11m 29s
Pytest Windows (3.11)	8m 21s
Pytest Windows (3.12)	8m 58s
Pytest Ubuntu (3.13)	9m 48s
Check consistency of requirements	18s
Isolated pytest Ubuntu	7m 52s
Typescript tests coverage	48s
Pytest MacOS (3.13)	8m 27s
Pytest MacOS (3.11)	9m 44s
Pytest MacOS (3.12)	10m 37s
Notebook Tests against PR	9m 51s
Typescript lint check	31s
Changed Notebooks Isolated Test against Cirq stable (partition-3)	57s
Changed Notebooks Isolated Test against Cirq stable (partition-0)	56s
Changed Notebooks Isolated Test against Cirq stable (partition-1)	59s
Changed Notebooks Isolated Test against Cirq stable (partition-2)	56s
Typescript tests	38s
Bundle file consistency	32s
	2h 20m 27s

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