[TEST] add a test for ElasticSearchRecordable

[sjinks]

Changes

This PR adds a test for opentelemetry::exporter::logs::ElasticSearchRecordable and updates the (disabled) tests for Elasticsearch Logs Exporter to ensure they compile.

The plan is to refactor the ES Recordable to use the ADL Serializer. This will make the code much more readable and maintainable (no need to use nostd::holds_alternative or value.index() + nostd::get() and keep the list of the types up-to-date). That is why we need a test to make sure that the refactoring will not break the things.

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

[netlify]

✅ Deploy Preview for opentelemetry-cpp-api-docs canceled.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.86%. Comparing base (4341e12) to head (92e96e1).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3154   +/-   ##
=======================================
  Coverage   87.86%   87.86%           
=======================================
  Files         195      195           
  Lines        6151     6151           
=======================================
  Hits         5404     5404           
  Misses        747      747           

---- 🚨 Try these New Features:

• Flaky Tests Detection - Detect and resolve failed and flaky tests

[sjinks]

Bazel on MacOS and IWYU failed for unrelated to this PR reasons; I cannot restart these jobs.

[marcalff]

LGTM, thanks for the fix.

[marcalff]

Waiting a bit for possible comments, then will merge.