[Docs] Merged NCCL and RCCL tests examples under `Clusters` into one #6006

Job	Run time
compute-version	3s
build-docs / build-docs	1m 11s
build-artifacts / frontend-build	9s
build-artifacts / code-lint	41s
build-artifacts / gateway-build	12s
build-artifacts / runner-test (macos-latest)	1m 17s
build-artifacts / runner-test (ubuntu-latest)	55s
build-artifacts / python-build	22s
build-artifacts / generate-json-schema	21s
build-artifacts / python-test (macos-latest, 3.9)	2m 15s
build-artifacts / python-test (macos-latest, 3.10)	3m 18s
build-artifacts / python-test (macos-latest, 3.13)	2m 29s
build-artifacts / python-test (macos-latest, 3.11)	3m 31s
build-artifacts / python-test (ubuntu-latest, 3.9)	4m 29s
build-artifacts / python-test (macos-latest, 3.12)	3m 10s
build-artifacts / python-test (windows-latest, 3.11)	2m 7s
build-artifacts / python-test (ubuntu-latest, 3.11)	4m 35s
build-artifacts / python-test (ubuntu-latest, 3.12)	4m 41s
build-artifacts / python-test (ubuntu-latest, 3.10)	4m 49s
build-artifacts / python-test (windows-latest, 3.12)	2m 36s
build-artifacts / python-test (windows-latest, 3.9)	1m 48s
build-artifacts / python-test (windows-latest, 3.10)	1m 57s
build-artifacts / python-test (windows-latest, 3.13)	2m 1s
build-artifacts / python-test (ubuntu-latest, 3.13)	4m 18s
build-artifacts / runner-compile (ubuntu-24.04, linux, amd64)	36s
build-artifacts / runner-compile (ubuntu-24.04-arm, linux, arm64)	34s
upload-post-pypi-artifacts / upload-post-pypi-artifacts	14s
upload-pre-pypi-artifacts / upload-pre-pypi-artifacts	17s
	54m 56s

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