Remove some unused IAST/CI Visibility classes

[0xnm]

What does this PR do?

This PR removes some unused IAST/CI Visibility classes.

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Make sure you discussed the feature or bugfix with the maintaining team in an Issue
• Make sure each commit and the PR mention the Issue number (cf the CONTRIBUTING doc)

[mariusc83]

Thanks a lot for the help. Can you please rebase it on top of my current branch: mconstantin/rum-3389/add-trace-otel-feature-integration-tests, this way you can have the integration tests in place to verify.

The base branch was changed.

[codecov-commenter]

Codecov Report

Merging #2000 (4dc4063) into feature/otel-support (3bd8514) will increase coverage by 2.84%.
The diff coverage is n/a.

Additional details and impacted files

@@                   Coverage Diff                    @@
##           feature/otel-support    #2000      +/-   ##
========================================================
+ Coverage                 60.35%   63.19%   +2.84%     
========================================================
  Files                       808      753      -55     
  Lines                     30223    28501    -1722     
  Branches                   4951     4677     -274     
========================================================
- Hits                      18241    18010     -231     
+ Misses                    10761     9303    -1458     
+ Partials                   1221     1188      -33     

Files	Coverage Δ
...ce/src/main/java/com/datadog/trace/api/Config.java	49.09% <ø> (-2.45%)	⬇️
...java/com/datadog/trace/api/InstrumenterConfig.java	53.33% <ø> (-0.45%)	⬇️
...c/main/java/com/datadog/trace/core/CoreTracer.java	64.53% <ø> (+0.64%)	⬆️
...main/java/com/datadog/trace/core/StatusLogger.java	2.44% <ø> (+0.23%)	⬆️

... and 37 files with indirect coverage changes