[Extensions.Enrichment] Rename some AddTraceEnricher methods to TryAddTraceEnricher

[evgenyfedorov2]

Changes

Renamed some extension methods from AddTraceEnricher* to TryAddTraceEnricher* to better convey the idea of idempotency -duplicate registrations are not allowed nor make sense.

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)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.80%. Comparing base (dc6cf9e) to head (73f94cf).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3085      +/-   ##
==========================================
+ Coverage   69.60%   69.80%   +0.19%     
==========================================
  Files         420      410      -10     
  Lines       16317    16199     -118     
==========================================
- Hits        11358    11308      -50     
+ Misses       4959     4891      -68     

Flag	Coverage Δ
unittests-Extensions	90.65% <ø> (ø)
unittests-Extensions.Enrichment	100.00% <100.00%> (ø)
unittests-Instrumentation.Cassandra	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...chment/TraceEnrichmentProviderBuilderExtensions.cs	100.00% <100.00%> (ø)
...ment/TraceEnrichmentServiceCollectionExtensions.cs	100.00% <100.00%> (ø)

... and 17 files with indirect coverage changes

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[dariusclay]

LGTM, better naming to match underlying behavior