Automate the renew of the cert used in test

[TingDaoK]

Issue #, if available:

• AI generated Github Action to automate the process to renew the cert used in the tests.
• We use cert in our tests for the local server and client the test the tls. But the cert cannot last forever, when it expires, we need to manually renew them.
• It's a bit hard to find where the issue is given the error is just tls time out mostly. So, automate this process to happen is much better comparing to let the devs to do this every ~800 days.
• chore: renew test certificates #541 tested the path to generate the new cert and create PR

Description of changes:

• https://github.com/awslabs/aws-c-http/actions/runs/20445411465/job/58747688996?pr=540 after we already merged the renewed cert
• https://github.com/awslabs/aws-c-http/actions/runs/20444935869/job/58746246658 before we merge the cert. It detects the cert has expired, and create new PR chore: renew test certificates #541 that works.

TODO: should apply similarly to aws-c-io

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[azkrishpy]

are we okay with checking in emojis in code lol

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.69%. Comparing base (1fbeb2e) to head (30c53f6).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #540      +/-   ##
==========================================
- Coverage   79.71%   79.69%   -0.02%     
==========================================
  Files          28       28              
  Lines       11868    11868              
==========================================
- Hits         9460     9458       -2     
- Misses       2408     2410       +2     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.