DEBUG-3568 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: 8447a7c
Test service: dd-trace-rb

✅ 0 Failed, 20438 Passed, 1369 Skipped, 3m 12.67s Total Time

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-03-18 19:20:50

Comparing candidate commit 8447a7c in PR branch transport-dry-4 with baseline commit 7d88b81 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 95.91837% with 2 lines in your changes missing coverage. Please review.

Project coverage is 97.72%. Comparing base (7d88b81) to head (8447a7c).
Report is 693 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%   97.72%   +0.02%     
==========================================
  Files        1381     1383       +2     
  Lines       83973    83939      -34     
  Branches     4251     4254       +3     
==========================================
- Hits        82043    82027      -16     
+ Misses       1930     1912      -18     

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[Strech]

👍🏼 Cool

P.S I have a feeling that we might want to mark second argument with name, but it's not a blocker

[p-datadog]

I am currently focusing on removing duplication from the transport code and making it more streamlined but if you have specific requests/suggestions I can probably sneak them in.