fix(test): Wait in pprof test

[thomaspoignant]

Description

Tests are flaky since we have introduce the pprof tests. Adding a waiting period in the tests to have the server ready.

Checklist

• [x] I have tested this code
• [x] I have added unit test to cover this code
• [x] I have followed the contributing guide

[netlify[bot]]

✅ Deploy Preview for go-feature-flag-doc-preview ready!

Name	Link
🔨 Latest commit	f5d061261df6d34fd518b74af826be3ed8054b00
🔍 Latest deploy log	https://app.netlify.com/sites/go-feature-flag-doc-preview/deploys/671bf98f9028310008b885e3
😎 Deploy Preview	https://deploy-preview-2576--go-feature-flag-doc-preview.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[netlify[bot]]

✅ Deploy Preview for go-feature-flag-doc-preview canceled.

Name	Link
🔨 Latest commit	c5f4dc889258d28a37fcbed58dfee287d5092e03
🔍 Latest deploy log	https://app.netlify.com/sites/go-feature-flag-doc-preview/deploys/671bf99adfaa2000084c11bd

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 85.48%. Comparing base (e0b7cff) to head (c5f4dc8). Report is 2 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2576 +/- ## ======================================= Coverage 85.48% 85.48% ======================================= Files 100 100 Lines 4444 4444 ======================================= Hits 3799 3799 Misses 516 516 Partials 129 129 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.