Remove unspecified dependencies in maven pom publishing

[AndreKurait]

Description

Remove unspecified dependencies in maven pom publishing

We were having one dependency that was unspecified opentelemetry-testing because it was only used in a testFixtures and wasn't in the resolution classpath. Fixed that and added a check before publishing that all versions are specified.

• Category: Bug Fix
• Why these changes are required? Usable Maven Pom files
• What is the old behavior before changes and new behavior after changes? opentelemetry-testing didn't include a version

Issues Resolved

N/A

Is this a backport? If so, please add backport PR # and/or commits #

Testing

ran ./gradlew publishToMavenLocal

Check List

• New functionality includes testing
  • All tests pass, including unit test, integration test and doctest
• New functionality has been documented
• Commits are signed per the DCO using --signoff

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.66%. Comparing base (db0075e) to head (05ac28d).
Report is 4 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1100      +/-   ##
============================================
- Coverage     80.66%   80.66%   -0.01%     
+ Complexity     2893     2892       -1     
============================================
  Files           383      383              
  Lines         14361    14359       -2     
  Branches        989      989              
============================================
- Hits          11584    11582       -2     
+ Misses         2184     2183       -1     
- Partials        593      594       +1     

Flag	Coverage Δ
gradle-test	78.74% <ø> (-0.01%)	⬇️
python-test	90.33% <ø> (ø)

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[gregschohn]

Approving, assuming that you'll get to the two comments that I've added.