chore(build): turn off extension hash cache on 3.10

[taegyunkim]

Multiple PRs experienced tests/smoke_test.py failing on build_base_venv jobs, blocking merging those PRs, examples include

• ci: add riot hash to DD_TAGS [backport 3.10] #14310
• chore: add traceback info to the failed to send message [backport 3.10] #14353

Checklist

• PR author has checked that all the criteria below are met
• The PR description includes an overview of the change
• The PR description articulates the motivation for the change
• The change includes tests OR the PR description describes a testing strategy
• The PR description notes risks associated with the change, if any
• Newly-added code is easy to change
• The change follows the library release note guidelines
• The change includes or references documentation updates if necessary
• Backport labels are set (if applicable)

Reviewer Checklist

• Reviewer has checked that all the criteria below are met
• Title is accurate
• All changes are related to the pull request's stated goal
• Avoids breaking API changes
• Testing strategy adequately addresses listed risks
• Newly-added code is easy to change
• Release note makes sense to a user of the library
• If necessary, author has acknowledged and discussed the performance implications of this PR as reported in the benchmarks PR comment
• Backport labels are set in a manner that is consistent with the release branch maintenance policy

[github-actions]

CODEOWNERS have been resolved as:

.gitlab/templates/cached-testrunner.yml                                 @DataDog/python-guild @DataDog/apm-core-python

[github-actions]

Bootstrap import analysis

Comparison of import times between this PR and base.

Summary

The average import time from this PR is: 280 ± 3 ms.

The average import time from base is: 284 ± 3 ms.

The import time difference between this PR and base is: -3.2 ± 0.1 ms.

Import time breakdown

The following import paths have shrunk:

ddtrace.auto 2.109 ms (0.75%)

ddtrace.bootstrap.sitecustomize 1.389 ms (0.50%)

ddtrace.bootstrap.preload 1.389 ms (0.50%)

ddtrace.internal.remoteconfig.client 0.681 ms (0.24%)

ddtrace 0.721 ms (0.26%)

ddtrace.internal._unpatched 0.067 ms (0.02%)

subprocess 0.036 ms (0.01%)

contextlib 0.036 ms (0.01%)

json 0.031 ms (0.01%)

json.decoder 0.031 ms (0.01%)

re 0.031 ms (0.01%)

enum 0.031 ms (0.01%)

types 0.031 ms (0.01%)

[P403n1x87]

Is this because we miss some other CI fixes on this release branch?

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-08-20 15:21:44

Comparing candidate commit 59edd6e in PR branch taegyunkim/trigger-build with baseline commit 47b9f8e in branch 3.10.

Found 0 performance improvements and 2 performance regressions! Performance is the same for 499 metrics, 3 unstable metrics.

scenario:iastaspectsospath-ospathsplitdrive_aspect

• 🟥 execution_time [+581.736ns; +659.023ns] or [+15.702%; +17.788%]

scenario:telemetryaddmetric-1-distribution-metric-1-times

• 🟥 execution_time [+404.006ns; +453.147ns] or [+13.678%; +15.341%]