Decouple integration tests from the requests library

[mwdd146980]

What does this PR do?

Removes hardcoded requests library coupling from the test suites of seven integrations, so the tests keep working when the HTTP backend swaps from requests to httpx. Each test is moved onto a sanctioned, backend-agnostic seam:

• mock_http (patches the AgentCheck.http property) for checks that call self.http directly.
• mock_http_response / mock_http_response_per_endpoint (the single central _DEFAULT_MOCK_METHOD seam) for OpenMetrics and response-body cases.
• Agnostic exceptions from datadog_checks.base.utils.http_exceptions in place of requests.exceptions.*.

Integrations touched: crio, flink, nginx_ingress_controller, nginx (VTS), silk, http_check, nvidia_nim, dell_powerflex. This is a test-only change: no production code and no changelog entries.

Motivation

Tests that hardcode mock.patch('requests.Session.get'/'.post'/'.request'), import from requests.exceptions, or patch requests.Response.json bypass the sanctioned fixtures and would break silently once the backend is no longer requests. Centralizing them on the agnostic fixtures/exceptions makes the eventual httpx cutover a single-seam change instead of a scattered one. Stacked on #24516.

Out of scope: kube_* (already migrated by the catch-narrowing branch), and vsphere / openstack_controller (blocked on their production HTTP migration).

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Add qa/required if this PR needs QA validation, or qa/skip-qa if it does not. Exactly one of the two is required.
• If you need to backport this PR to another branch, you can add the backport/<branch-name> label to the PR and it will automatically open a backport PR once this one is merged

[datadog-official]

 

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

🎯 Code Coverage (details)
• Patch Coverage: 97.78%
• Overall Coverage: 96.01% (+7.72%)

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[dd-octo-sts]

Validation Report

Validation	Description	Status
qa-label	Validate the pull request declares whether it needs QA for the next Agent release	❌

Run ddev validate all changed --fix to attempt to auto-fix supported validations.

Passed validations (20)

Validation	Description	Status
agent-reqs	Verify check versions match the Agent requirements file	✅
ci	Validate CI configuration and code coverage 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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