fix: add schematize service name for django caching [backport 2.19]

[github-actions]

Backport 6613185 from #11843 to 2.19.

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

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-01-16 18:23:07

Comparing candidate commit 8e5bf1d in PR branch backport-11843-to-2.19 with baseline commit e16d68c in branch 2.19.

Found 2 performance improvements and 0 performance regressions! Performance is the same for 378 metrics, 2 unstable metrics.

scenario:iast_aspects-ospathdirname_aspect

• 🟩 execution_time [-454.075ns; -387.331ns] or [-11.006%; -9.388%]

scenario:iast_aspects-ospathsplitext_aspect

• 🟩 execution_time [-349.242ns; -288.777ns] or [-8.874%; -7.338%]

[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