Fix initial double remote config reading

[bwoebi]

This also prevents an use-after-free given that only ddtrace_rinit_remote_config will initialize DDTRACE_G(active_rc_hooks).

This use-after-free only manifests sometimes on consecutive requests where both requests end up using live-debugger resources.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.38%. Comparing base (aeeec62) to head (b8c57b1).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #3225   +/-   ##
=========================================
  Coverage     76.38%   76.38%           
  Complexity     2948     2948           
=========================================
  Files           145      145           
  Lines         16076    16076           
  Branches       1107     1107           
=========================================
  Hits          12280    12280           
  Misses         3221     3221           
  Partials        575      575           

Flag	Coverage Δ
appsec-extension	68.80% <ø> (ø)
tracer-php	79.28% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update aeeec62...b8c57b1. Read the comment docs.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[pr-commenter]

Benchmarks [ tracer ]

Benchmark execution time: 2025-04-28 18:30:45

Comparing candidate commit 71ba6fe in PR branch bob/fix-rc-use-after-free with baseline commit aeeec62 in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 178 metrics, 0 unstable metrics.

[morrisonlevi]

Being honest, I don't know what's going on here, but it's supposed to fix a bug, so I'll trust you.