[ddev] Retry agent check on transient failure to fix SNMP E2E flake

[Kyle-Neale]

What does this PR do?

Wraps agent check invocations in ddev env agent with a bounded retry (3 attempts, 0.5s backoff).

Motivation

Mitigates the SNMP master.yml E2E flake (no valid check found) — a brief race in the existing E2E config-swap path where autodiscovery can deregister the check between the swap and the immediate agent check call. ~44% of recent master SNMP runs hit this; >99% of tests still pass within failing runs.

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Add the qa/skip-qa label if the PR doesn't need to be tested during QA.
• 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

[codecov]

Codecov Report

❌ Patch coverage is 52.94118% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.85%. Comparing base (996b3d5) to head (bd4527c).
⚠️ Report is 13 commits behind head on master.

Additional details and impacted files

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[datadog-datadog-prod-us1]

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

🎯 Code Coverage (details)
• Patch Coverage: 52.94%
• Overall Coverage: 87.36%

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: bd4527c | Docs | Datadog PR Page | Give us feedback!}

[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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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

End the changelog entry with a period

The repository instructions in AGENTS.md say changelog entries should be a single line that ends with a period. This new entry currently has no trailing period, so it violates the documented changelog format and should be updated before merging.

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