WebSockets Next: merge BlockingSender and Sender interfaces #47014

Job	Run time
Initial JDK 17 Build	8m 9s
CI Sanity Check	32s
Attach pull request number	2s
Calculate Test Jobs	9s
JVM Tests - JDK 17	8m 21s
JVM Tests - JDK 21	9m 10s
Gradle Tests - JDK ${{ matrix.java.name }}	0s
JVM Tests - JDK 17 Windows	13m 6s
Maven Tests - JDK ${{ matrix.java.name }}	0s
Devtools Tests - JDK ${{ matrix.java.name }}	0s
Kubernetes Tests - JDK ${{ matrix.java.name }}	0s
Quickstarts Compilation - JDK 17	6m 32s
Native Tests - HTTP	4m 21s
Native Tests - Virtual Thread - ${{ matrix.category }}	0s
MicroProfile TCKs Tests	0s
Upload build stats to collector	0s
Build report	45s
	51m 7s

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