Migrate squid tests to mock_http fixture

[mwdd146980]

Motivation

Test fixtures patching requests.Session.get will silently break when squid switches from requests to httpx. Migrate to mock_http fixture + MockHTTPResponse so tests are transport-agnostic.

Approach

• Replace mock.patch('datadog_checks.squid.squid.requests.Session.get') with mock_http fixture in test_unit.py (3 tests).
• Replace mock.patch('datadog_checks.base.utils.http.requests.Session.get') with mock_http fixture in test_squid.py::test_version_metadata.

Verification

ddev test -fs squid
ddev --no-interactive test squid

All unit tests pass. dd_environment-gated tests fail at fixture setup due to local Docker image pull (pre-existing, unrelated to this change).

[datadog-prod-us1-3]

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 100.00% (+12.73%)

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: 2dd0b0c | Docs | Datadog PR Page | Give us feedback!}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.99%. Comparing base (610bb2b) to head (2dd0b0c).
⚠️ Report is 1 commits behind head on mwdd146980/httpx-migration-base.

Additional details and impacted files

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[mwdd146980]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. 👍

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[dd-octo-sts]

Validation Report

All 20 validations passed.

Show details

Validation	Description	Status
agent-reqs	Verify check versions match the Agent requirements file	✅
ci	Validate CI configuration and Codecov settings	✅
codeowners	Validate every integration has a CODEOWNERS entry	✅
config	Validate default configuration files against spec.yaml	✅
dep	Verify dependency pins are consistent and Agent-compatible	✅
http	Validate integrations use the HTTP wrapper correctly	✅
imports	Validate check imports do not use deprecated modules	✅
integration-style	Validate check code style conventions	✅
jmx-metrics	Validate JMX metrics definition files and config	✅
labeler	Validate PR labeler config matches integration directories	✅
legacy-signature	Validate no integration uses the legacy Agent check signature	✅
license-headers	Validate Python files have proper license headers	✅
licenses	Validate third-party license attribution list	✅
metadata	Validate metadata.csv metric definitions	✅
models	Validate configuration data models match spec.yaml	✅
openmetrics	Validate OpenMetrics integrations disable the metric limit	✅
package	Validate Python package metadata and naming	✅
readmes	Validate README files have required sections	✅
saved-views	Validate saved view JSON file structure and fields	✅
version	Validate version consistency between package and changelog	✅

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