[CONFIGURATION] File configuration - spec stability

[marcalff]

Fixes # (issue)

Changes

Please provide a brief description of the changes here.

• Rename OTEL_EXPERIMENTAL_CONFIG_FILE to OTEL_CONFIG_FILE.

For significant contributions please make sure you have completed the following items:

• CHANGELOG.md updated for non-trivial changes
• Unit tests have been added
• Changes in public API reviewed

[marcalff]

Do not merge, blocked by:

• Mark declarative config as stable opentelemetry-specification#4568
• Cut stable 1.0.0 release opentelemetry-configuration#161

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.05%. Comparing base (b646e8c) to head (8fe53e6).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3862   +/-   ##
=======================================
  Coverage   90.05%   90.05%           
=======================================
  Files         226      226           
  Lines        7200     7200           
=======================================
  Hits         6483     6483           
  Misses        717      717           

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[lalitb]

Do we want to wait for this to be resolved - open-telemetry/opentelemetry-configuration#161

[marcalff]

Do we want to wait for this to be resolved - open-telemetry/opentelemetry-configuration#161

Yes.

I expect that these two will be resolved at the same time:

• Mark declarative config as stable opentelemetry-specification#4568
• Cut stable 1.0.0 release opentelemetry-configuration#161