Add test coverage

[Hector Hernandez (hectorhdzg)]

Increased coverage from 77% to %92

[Copilot]

Pull request overview

This PR focuses on increasing automated test coverage for the Microsoft OpenTelemetry distro, and wiring coverage reporting into the test tooling.

Changes:

• Enable pytest coverage collection via pytest-cov and coverage.py configuration.
• Add new unit tests for instrumentation dependency-conflict detection and Azure Monitor browser SDK loader behavior.
• Extend existing tests and adjust Django middleware initialization to support environments without Django.

Reviewed changes

Copilot reviewed 11 out of 12 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
tox.ini	Adds pytest --cov invocation so tox runs generate coverage output.
pyproject.toml	Adds pytest-cov to optional deps and configures coverage source/reporting.
dev_requirements.txt	Adds pytest-cov to dev test dependencies used by tox.
tests/test_instrumentation.py	New unit tests for core _instrumentation dependency conflict helpers.
tests/test_distro.py	Adds tests for _setup_logging() behavior.
tests/conftest.py	Removes collection ignore configuration (file becomes effectively empty).
tests/azure_monitor/utils/test_instrumentation.py	New unit tests for Azure Monitor instrumentation conflict helpers.
tests/azure_monitor/test_configure.py	Updates tests to align with refactors around instrumentation setup and browser SDK loader setup.
tests/azure_monitor/browserSdkLoader/test_snippet_injector.py	Adds broader test coverage for snippet injection, compression handling, and statsbeat marking.
tests/azure_monitor/browserSdkLoader/test_init.py	New tests for browser SDK loader Django integration setup utilities.
src/microsoft/opentelemetry/_azure_monitor/_browser_sdk_loader/django_middleware.py	Guards super().__init__ call when Django isn’t installed (stub mixin).
.coverage	Adds a generated coverage DB artifact to the repo.

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