Remove -alpha artifacts from runtime classpath of stable components

[jack-berg]

Related to #6970.

Remove -alpha artifacts (especially opentelemetry-api-incubator) from the runtime classpath of stable components.

Approach is:

• Switch from implementation to compileOnly dependencies
• Adjust internals to detect whether -alpha artifact is present on classpath (i.e. provided by the user) and toggle behavior based on whether it is or isnt
• To ensure safety when -alpha artifacts are not provided by user, make sure main test suite runs without -alpha artifacts.
• To ensure safety when -alpha artifacts are present, introduce new test suite including the -alpha artifacts, and test the impacted behavior

This is related to a possible adjustment of our versioning guidelines. If we went in this direction, a user adding only stable dependencies could always run ./gradlew dependencies and will not see any -alpha artifacts on the runtime classpath.

[codecov]

Codecov Report

Attention: Patch coverage is 88.88889% with 24 lines in your changes missing coverage. Please review.

Project coverage is 89.94%. Comparing base (492b94f) to head (5c9f900).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...pentelemetry/sdk/trace/ExtendedSdkSpanBuilder.java	63.63%	16 Missing ⚠️
...elemetry/sdk/logs/ExtendedSdkLogRecordBuilder.java	63.63%	8 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6944      +/-   ##
============================================
- Coverage     89.99%   89.94%   -0.06%     
- Complexity     6596     6634      +38     
============================================
  Files           729      745      +16     
  Lines         19858    20010     +152     
  Branches       1955     1962       +7     
============================================
+ Hits          17871    17997     +126     
- Misses         1389     1417      +28     
+ Partials        598      596       -2     

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[jack-berg]

Not sure why, but these new graal nativeTest woked without any additional reflect-config.json entries, despite new reflective access in the SDK via Class.forName. 🤔

[trask]

nice!

[trask]

Suggested change

import static org.assertj.core.api.Assertions.assertThat;

[jack-berg]

Why does the build pass despite this unused import? 🤔