Revert "Fix the query hashing algorithm (#6205)"

[abernix]

This branch is based on v1.59.1 but reverts commit c5e1246 from #6205. This preserves the rest of the work done in the v1.59.x series, including the Datadog priority sampling fix which was a critical bug fix for some users.

The justification for this reversal is currently only hunch-based, but we are trying to investigate an increased cache hit miss rate observed on v1.59.0. Reverting this commit is the easiest way to eliminate #6205 as the cause.

[svc-apollo-docs]

⚠️ Docs preview not attached to branch

The preview was not built because the PR's base branch dev is not in the list of sources.

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• !docs set-base-branch next
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Build ID: 71d3c0bf62acea330e6a80bd

[router-perf]

CI performance tests

• connectors-const - Connectors stress test that runs with a constant number of users
• 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
• 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