WaitFor riak e2e to populate before starting

[sarah-witt]

What does this PR do?

Attempts to make riak e2e less flakey by waiting to populate the data first. If this doesn't help flakiness I'll also relax the constraints for gauges here: https://github.com/DataDog/integrations-core/blob/master/riak/tests/test_e2e.py#L24

Motivation

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

[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit: 55ca4e8ba3

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.03%. Comparing base (3223e87) to head (b2df96e).
⚠️ Report is 6 commits behind head on master.

Additional details and impacted files

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[sarah-witt]

@codex review

[github-actions]

⚠️ Recommendation: Add qa/skip-qa label

This PR does not modify any files shipped with the agent.

To help streamline the release process, please consider adding the qa/skip-qa label if these changes do not require QA testing.

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: b2df96ee6b

ℹ️ About Codex in GitHub

Codex has been enabled to automatically review pull requests in this repo. Reviews are triggered when you

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

If Codex has suggestions, it will comment; otherwise it will react with 👍.

When you sign up for Codex through ChatGPT, Codex can also answer questions or update the PR, like "@codex address that feedback".