fix(internal): fix telemetry URL for EU [backport 2.9]

[vitor-de-araujo]

Backport 513f7e5 from #10021 to 2.9.

This PR fixes incorrect URL for telemetry intake in EU that was causing missing telemetry data and SSL error log messages.

Checklist

• PR author has checked that all the criteria below are met
• The PR description includes an overview of the change
• The PR description articulates the motivation for the change
• The change includes tests OR the PR description describes a testing strategy
• The PR description notes risks associated with the change, if any
• Newly-added code is easy to change
• The change follows the library release note guidelines
• The change includes or references documentation updates if necessary
• Backport labels are set (if applicable)

Reviewer Checklist

• Reviewer has checked that all the criteria below are met
• Title is accurate
• All changes are related to the pull request's stated goal
• Avoids breaking API changes
• Testing strategy adequately addresses listed risks
• Newly-added code is easy to change
• Release note makes sense to a user of the library
• If necessary, author has acknowledged and discussed the performance implications of this PR as reported in the benchmarks PR comment
• Backport labels are set in a manner that is consistent with the release branch maintenance policy

[datadog-dd-trace-py-rkomorn]

Datadog Report

Branch report: backport-10021-to-2.9
Commit report: 78cfe57
Test service: dd-trace-py

✅ 0 Failed, 492 Passed, 12 Skipped, 2m 12.14s Total Time

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 10.22%. Comparing base (fc6ee13) to head (f02c60b).
Report is 2 commits behind head on 2.9.

Files	Patch %	Lines
ddtrace/internal/telemetry/writer.py	0.00%	1 Missing ⚠️
tests/telemetry/test_writer.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              2.9   #10055      +/-   ##
==========================================
- Coverage   19.06%   10.22%   -8.84%     
==========================================
  Files        1259     1258       -1     
  Lines      120828   120848      +20     
==========================================
- Hits        23032    12356   -10676     
- Misses      97796   108492   +10696     

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[pr-commenter]

Benchmarks

Benchmark execution time: 2024-08-02 11:37:21

Comparing candidate commit f02c60b in PR branch backport-10021-to-2.9 with baseline commit 4d73860 in branch 2.9.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 175 metrics, 9 unstable metrics.