Remove unused StreamableHTTPTransport.get_session_id() #3740

Job	Run time
checks / readme-snippets	17s
checks / pre-commit	1m 6s
checks / docs	57s
checks / test (3.10, locked, windows-latest)	1m 49s
checks / test (3.12, locked, ubuntu-latest)	1m 47s
checks / test (3.12, lowest-direct, windows-latest)	1m 43s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 8s
checks / test (3.11, locked, windows-latest)	1m 50s
checks / test (3.13, locked, ubuntu-latest)	1m 16s
checks / test (3.10, locked, ubuntu-latest)	1m 32s
checks / test (3.10, lowest-direct, windows-latest)	2m 7s
checks / test (3.11, locked, ubuntu-latest)	1m 24s
checks / test (3.14, locked, ubuntu-latest)	1m 25s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 28s
checks / test (3.14, lowest-direct, windows-latest)	1m 45s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 9s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 28s
checks / test (3.13, locked, windows-latest)	1m 49s
checks / test (3.14, locked, windows-latest)	1m 58s
checks / test (3.13, lowest-direct, windows-latest)	2m 20s
checks / test (3.11, lowest-direct, windows-latest)	1m 45s
checks / test (3.12, locked, windows-latest)	1m 49s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 30s
all-green	5s
	35m 27s

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