Run StreamableHTTP transport tests in process instead of over sockets #2457

Job	Run time
checks / pre-commit	36s
checks / readme-snippets	11s
checks / test (3.10, lowest-direct, windows-latest)	1m 44s
checks / test (3.11, locked, windows-latest)	1m 42s
checks / test (3.10, locked, ubuntu-latest)	51s
checks / test (3.10, locked, windows-latest)	1m 23s
checks / test (3.14, locked, windows-latest)	2m 11s
checks / test (3.11, lowest-direct, windows-latest)	1m 20s
checks / test (3.11, lowest-direct, ubuntu-latest)	51s
checks / test (3.12, locked, windows-latest)	1m 22s
checks / test (3.13, locked, ubuntu-latest)	45s
checks / test (3.13, lowest-direct, windows-latest)	1m 20s
checks / test (3.11, locked, ubuntu-latest)	48s
checks / test (3.13, lowest-direct, ubuntu-latest)	53s
checks / test (3.12, locked, ubuntu-latest)	56s
checks / test (3.12, lowest-direct, ubuntu-latest)	58s
checks / test (3.14, locked, ubuntu-latest)	1m 55s
checks / test (3.10, lowest-direct, ubuntu-latest)	55s
checks / test (3.14, lowest-direct, windows-latest)	1m 15s
checks / test (3.13, locked, windows-latest)	1m 22s
checks / test (3.12, lowest-direct, windows-latest)	1m 30s
checks / test (3.14, lowest-direct, ubuntu-latest)	41s
all-green	4s
	25m 33s

Provide feedback