Speedup ContextInstances if there are null instances #37971

Job	Run time
Attach pull request number	3s
CI Sanity Check	32s
Initial JDK 17 Build	11m 52s
Calculate Test Jobs	9s
Gradle Tests - JDK 17	24m 24s
JVM Tests - JDK 17	3h 41m 12s
Gradle Tests - JDK 17 Windows	51m 34s
JVM Tests - JDK 21	3h 36m 9s
Devtools Tests - JDK 17	50s
JVM Tests - JDK 17 Windows	3h 52m 20s
Kubernetes Tests - JDK 17	12m 14s
Devtools Tests - JDK 21	56s
Kubernetes Tests - JDK 21	12m 12s
Maven Tests - JDK 17	1h 4m 7s
Devtools Tests - JDK 17 Windows	2m 15s
Kubernetes Tests - JDK 17 Windows	16m 13s
Maven Tests - JDK 17 Windows	1h 24m 7s
Quickstarts Compilation - JDK 17	7m 14s
Native Tests - Virtual Thread - Main	22m 6s
MicroProfile TCKs Tests	47m 46s
Native Tests - Virtual Thread - Messaging	9m 38s
Native Tests - Main	6m 45s
Native Tests - Data1	30m 58s
Native Tests - Data2	28m 47s
Native Tests - Data3	23m 0s
Native Tests - Data4	18m 47s
Native Tests - Data5	21m 58s
Native Tests - Data6	23m 42s
Native Tests - Data7	34m 53s
Native Tests - Amazon	18m 7s
Native Tests - Messaging1	32m 10s
Native Tests - Messaging2	12m 46s
Native Tests - Security1	24m 40s
Native Tests - Security2	29m 37s
Native Tests - Security3	12m 22s
Native Tests - Cache	15m 50s
Native Tests - HTTP	40m 6s
Native Tests - Misc1	27m 7s
Native Tests - Misc2	18m 30s
Native Tests - Misc3	33m 20s
Native Tests - Misc4	45m 17s
Native Tests - Spring	19m 8s
Native Tests - gRPC	18m 29s
Native Tests - Windows - RESTEasy Jackson	5m 54s
Native Tests - DevTools Integration Tests	4m 4s
Native Tests - AWT, ImageIO and Java2D	8m 10s
Build report	36s
	1d 2h 32m 56s

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