Add GitHub Actions workflow for Python application

[Bensilva2]

This workflow installs Python dependencies, runs linting with flake8, and executes tests using pytest.

What does this PR do?

Motivation

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-prod-us1-5]

✨ Unblock PR with BitsAI

⚠️ Warnings

🚦 2 Pipeline jobs failed

Python application | build     

🔧 Fix in code. This looks caused by changes in this PR.

Compilation errors due to invalid syntax in multiple files including 'cache.py', 'resolver.py', and others. Invalid syntax: class ObfuscationLookup[K: Hashable] at ./datadog_checks_base/datadog_checks/base/utils/db/query_metrics/cache.py:15:25

Validate Pinned Actions | pinact     

🔧 Fix in code. This looks caused by changes in this PR.

GitHub Actions aren't pinned. Ensure actions are pinned to a specific commit SHA for security and reliability.

📋 Copy prompt for your agent

CI on my pull request is failing. Help me find and fix the root cause of each failing job below — they were flagged as caused by changes in this PR, so focus on the diff. For each job, explain the failure and propose a fix.

Branch: master

Python application | build
Commit: dd8f6aeb3369565c69a85aabb00d68b5a6962a7a
Error (code / build):
Compilation errors due to invalid syntax in multiple files including 'cache.py', 'resolver.py', and others. Invalid syntax: class ObfuscationLookup[K: Hashable] at ./datadog_checks_base/datadog_checks/base/utils/db/query_metrics/cache.py:15:25
CI job: https://github.com/DataDog/integrations-core/actions/runs/31752072402/job/94619797306

Validate Pinned Actions | pinact
Commit: dd8f6aeb3369565c69a85aabb00d68b5a6962a7a
Error (code / build):
GitHub Actions aren't pinned. Ensure actions are pinned to a specific commit SHA for security and reliability.
CI job: https://github.com/DataDog/integrations-core/actions/runs/31752072443/job/94619797567

Useful? React with 👍 / 👎

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🔗 Commit SHA: dd8f6ae | Docs | Datadog PR Page | Give us feedback!}

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: dd8f6aeb33

ℹ️ About Codex in GitHub

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• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

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