fix: gate ClientSessionGroup lists on capabilities #2938

Job	Run time
checks / pre-commit	44s
checks / readme-snippets	14s
checks / test (3.12, lowest-direct, ubuntu-latest)	57s
checks / test (3.10, lowest-direct, windows-latest)	1m 28s
checks / test (3.11, locked, ubuntu-latest)	55s
checks / test (3.11, locked, windows-latest)	1m 23s
checks / test (3.11, lowest-direct, ubuntu-latest)	55s
checks / test (3.13, lowest-direct, ubuntu-latest)	50s
checks / test (3.13, lowest-direct, windows-latest)	1m 53s
checks / test (3.13, locked, windows-latest)	1m 31s
checks / test (3.12, locked, ubuntu-latest)	52s
checks / test (3.14, lowest-direct, ubuntu-latest)	49s
checks / test (3.13, locked, ubuntu-latest)	51s
checks / test (3.10, locked, ubuntu-latest)	58s
checks / test (3.12, locked, windows-latest)	1m 50s
checks / test (3.10, locked, windows-latest)	2m 23s
checks / test (3.12, lowest-direct, windows-latest)	1m 15s
checks / test (3.11, lowest-direct, windows-latest)	1m 36s
checks / test (3.14, lowest-direct, windows-latest)	1m 46s
checks / test (3.10, lowest-direct, ubuntu-latest)	59s
checks / test (3.14, locked, ubuntu-latest)	1m 58s
checks / test (3.14, locked, windows-latest)	2m 9s
all-green	5s
	28m 21s

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