DRY transport exceptions

[p-datadog]

What does this PR do?

Moves the "endpoint not supported" and "endpoint not defined" exceptions into the core.

Motivation:
Currently these exceptions are defined for each endpoint but their contents is identical.

Change log entry
None

Additional Notes:

How to test the change?
Existing unit tests

[github-actions]

Thank you for updating Change log entry section 👏

^{Visited at: 2025-03-12 14:14:55 UTC}

[datadog-datadog-prod-us1]

Datadog Report

Branch report: transport-dry-4
Commit report: 6104c35
Test service: dd-trace-rb

✅ 0 Failed, 20626 Passed, 1373 Skipped, 3m 16.34s Total Time

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-03-12 14:36:03

Comparing candidate commit 6104c35 in PR branch transport-dry-4 with baseline commit 65b2901 in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 31 metrics, 2 unstable metrics.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 93.54839% with 2 lines in your changes missing coverage. Please review.

Project coverage is 97.70%. Comparing base (65b2901) to head (6104c35).
Report is 26 commits behind head on master.

Files with missing lines	Patch %	Lines
lib/datadog/core/remote/transport/http/config.rb	66.66%	1 Missing ⚠️
.../datadog/core/remote/transport/http/negotiation.rb	66.66%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4484   +/-   ##
=======================================
  Coverage   97.70%   97.70%           
=======================================
  Files        1379     1381    +2     
  Lines       83881    83903   +22     
  Branches     4251     4256    +5     
=======================================
+ Hits        81953    81980   +27     
+ Misses       1928     1923    -5     

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