[aws] default to use Semantic Convention 1.28 and remove option Legacy

[ppittle]

Fixes #
Design discussion issue # Continuation of #2367

Changes

Update the OpenTelemetry.*.AWS libraries to to use Semantic Convention 1.28 and remove the option SemanticConventionVerisons.Legacy

Background

We determined that #2367, should not change Semantic Conventions by default, allowing users a non-breaking way to test opting in-to 1.28.

This is a fast follow up PR that removes SemanticConventionVersions.Legacy and changes the default to SemanticConventionVersions.V1_28_0. This PR is to be released as a Release Candidate.

This follows the release strategy for other contrib packages that have made similar breaking changes around Semantic Convention stabilization.

Merge requirement checklist

• CONTRIBUTING guidelines followed (license requirements, nullable enabled, static analysis, etc.)
• Unit tests added/updated
• Appropriate CHANGELOG.md files updated for non-trivial changes
• Changes in public API reviewed (if applicable)

[ppittle]

@Oberon00 - this PR come out of a discussion you and @alanwest and I were having in #2367.

Would you mind reviewing?

[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 7 days.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 0.00%. Comparing base (71655ce) to head (311410a).
Report is 674 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #2437       +/-   ##
==========================================
- Coverage   73.91%       0   -73.92%     
==========================================
  Files         267       0      -267     
  Lines        9615       0     -9615     
==========================================
- Hits         7107       0     -7107     
+ Misses       2508       0     -2508     

see 263 files with indirect coverage changes