fix: add schematize service name for django caching

[quinna-h]

Currently, we treat django caching as a separate service.
This is a quick fix so that behavior aligns with our public docs; inferred services connected to django should be directly connected to the third-party service not django.
The service name should adhere to the name rule from schematize_service_name rather than django.

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

[github-actions]

CODEOWNERS have been resolved as:

releasenotes/notes/django-cache-service-name-schematization-bef19b44b7414016.yaml  @DataDog/apm-python
ddtrace/contrib/internal/django/patch.py                                @DataDog/apm-core-python @DataDog/apm-idm-python
tests/contrib/django/test_django.py                                     @DataDog/apm-core-python @DataDog/apm-idm-python

[datadog-dd-trace-py-rkomorn]

Datadog Report

Branch report: django-cache-service-name
Commit report: 1b2be7e
Test service: dd-trace-py

✅ 0 Failed, 289 Passed, 1179 Skipped, 8m 47.95s Total duration (27m 34.96s time saved)

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-01-02 15:54:29

Comparing candidate commit 71a7f0b in PR branch django-cache-service-name with baseline commit 998ee2c in branch main.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 374 metrics, 2 unstable metrics.

[wconti27]

LGTM just need to address a few nits