feat(opentelemetry-configuration): add backup options for certificates and endpoints

[maryliag]

Part of #5945

Adding fallback for
OTEL_EXPORTER_OTLP_ENDPOINT
OTEL_EXPORTER_OTLP_CERTIFICATE
OTEL_EXPORTER_OTLP_CLIENT_KEY
OTEL_EXPORTER_OTLP_CLIENT_CERTIFICATE

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.15%. Comparing base (c67f1d4) to head (bd350e9).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6038   +/-   ##
=======================================
  Coverage   95.14%   95.15%           
=======================================
  Files         316      316           
  Lines        9166     9184   +18     
  Branches     2023     2053   +30     
=======================================
+ Hits         8721     8739   +18     
  Misses        445      445           

Files with missing lines	Coverage Δ
...try-configuration/src/EnvironmentConfigProvider.ts	100.00% <100.00%> (ø)

🚀 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.