fix: gate ClientSessionGroup lists on capabilities #2939

Job	Run time
checks / pre-commit	49s
checks / readme-snippets	14s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 5s
checks / test (3.14, lowest-direct, windows-latest)	2m 5s
checks / test (3.14, locked, windows-latest)	2m 31s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 3s
checks / test (3.14, locked, ubuntu-latest)	2m 6s
checks / test (3.13, lowest-direct, windows-latest)	1m 48s
checks / test (3.11, locked, ubuntu-latest)	58s
checks / test (3.10, locked, windows-latest)	1m 33s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 4s
checks / test (3.11, lowest-direct, windows-latest)	1m 49s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 4s
checks / test (3.11, locked, windows-latest)	1m 19s
checks / test (3.10, lowest-direct, windows-latest)	1m 46s
checks / test (3.12, lowest-direct, windows-latest)	1m 35s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 1s
checks / test (3.13, locked, ubuntu-latest)	59s
checks / test (3.12, locked, ubuntu-latest)	1m 4s
checks / test (3.13, locked, windows-latest)	1m 31s
checks / test (3.10, locked, ubuntu-latest)	1m 0s
checks / test (3.12, locked, windows-latest)	1m 45s
all-green	3s
	30m 12s

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