Slim ServerMiddleware to `(ctx, call_next)` and add `OpenTelemetryMid… #2917

Job	Run time
checks / readme-snippets	10s
checks / pre-commit	41s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 5s
checks / test (3.11, locked, ubuntu-latest)	59s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 3s
checks / test (3.14, lowest-direct, windows-latest)	1m 27s
checks / test (3.12, locked, windows-latest)	1m 37s
checks / test (3.13, locked, ubuntu-latest)	57s
checks / test (3.13, locked, windows-latest)	1m 33s
checks / test (3.14, locked, ubuntu-latest)	2m 7s
checks / test (3.12, lowest-direct, windows-latest)	2m 1s
checks / test (3.13, lowest-direct, windows-latest)	1m 42s
checks / test (3.11, lowest-direct, windows-latest)	1m 32s
checks / test (3.10, locked, ubuntu-latest)	1m 8s
checks / test (3.11, locked, windows-latest)	1m 43s
checks / test (3.12, locked, ubuntu-latest)	1m 3s
checks / test (3.10, lowest-direct, windows-latest)	1m 44s
checks / test (3.10, locked, windows-latest)	1m 32s
checks / test (3.14, lowest-direct, ubuntu-latest)	53s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 7s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 3s
checks / test (3.14, locked, windows-latest)	2m 25s
all-green	3s
	29m 35s

Provide feedback