many bugfixes for context implementation

CI performance tests

[ ] connectors-const - Connectors stress test that runs with a constant number of users
[x] const - Basic stress test that runs with a constant number of users
[ ] demand-control-instrumented - A copy of the step test, but with demand control monitoring and metrics enabled
[ ] demand-control-uninstrumented - A copy of the step test, but with demand control monitoring enabled
[ ] enhanced-signature - Enhanced signature enabled
[ ] events - Stress test for events with a lot of users and deduplication ENABLED
[ ] events_big_cap_high_rate - Stress test for events with a lot of users, deduplication enabled and high rate event with a big queue capacity
[ ] events_big_cap_high_rate_callback - Stress test for events with a lot of users, deduplication enabled and high rate event with a big queue capacity using callback mode
[ ] events_callback - Stress test for events with a lot of users and deduplication ENABLED in callback mode
[ ] events_without_dedup - Stress test for events with a lot of users and deduplication DISABLED
[ ] events_without_dedup_callback - Stress test for events with a lot of users and deduplication DISABLED using callback mode
[ ] extended-reference-mode - Extended reference mode enabled
[ ] large-request - Stress test with a 1 MB request payload
[ ] no-tracing - Basic stress test, no tracing
[ ] reload - Reload test over a long period of time at a constant rate of users
[ ] step-jemalloc-tuning - Clone of the basic stress test for jemalloc tuning
[ ] step-local-metrics - Field stats that are generated from the router rather than FTV1
[ ] step-with-prometheus - A copy of the step test with the Prometheus metrics exporter enabled
[x] step - Basic stress test that steps up the number of users over time
[ ] xlarge-request - Stress test with 10 MB request payload
[ ] xxlarge-request - Stress test with 100 MB request payload

apollographql / router

many bugfixes for context implementation #6280

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