opentelemetry-exporter-otlp-json-file: add OTLP JSON file Docker tests

[herin049]

Description

Add Docker based integration tests for the OTLP JSON File exporter.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

uv run tox -e docker-tests-otlpexporter

Does This PR Require a Contrib Repo Change?

• Yes. - Link to PR:
• No.

Checklist:

• Followed the style guidelines of this project
• Changelogs have been updated
• Unit tests have been added
• Documentation has been updated

[Copilot]

Pull request overview

Adds functional Docker-based coverage for the opentelemetry-exporter-otlp-json-file exporter by running an OpenTelemetry Collector Contrib instance configured with the otlp_json_file receiver and validating that traces/metrics/logs emitted by file exporters are received by the existing OTLP test server.

Changes:

• Extend the docker-tests-otlpexporter tox env to install the OTLP JSON proto + JSON exporter packages and prepare the bind-mounted file output directories.
• Add “file” variants to the existing OTLP traces/metrics/logs functional test matrices using FileSpanExporter, FileMetricExporter, and FileLogExporter.
• Update the Docker test collector setup (compose + config) to read *.jsonl from a host-mounted directory via otlp_json_file/* receivers.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tox.ini	Installs JSON OTLP packages for docker tests and prepares on-host directories used by the file exporter + collector tailing.
tests/opentelemetry-docker-tests/tests/otlpexporter/test_otlp_traces_functional.py	Adds FileSpanExporter to the functional test parameter set using a per-run .jsonl path.
tests/opentelemetry-docker-tests/tests/otlpexporter/test_otlp_metrics_functional.py	Adds FileMetricExporter to the functional test parameter set using a per-run .jsonl path.
tests/opentelemetry-docker-tests/tests/otlpexporter/test_otlp_logs_functional.py	Adds FileLogExporter to the functional test parameter set using a per-run .jsonl path.
tests/opentelemetry-docker-tests/tests/otlpexporter/conftest.py	Adds a session autouse cleanup fixture for stale .jsonl artifacts under the mounted directory.
tests/opentelemetry-docker-tests/tests/otlpexporter/__init__.py	Adds OTLP_FILE_DATA_DIR, lazy exporter kwargs support, and a helper to generate unique .jsonl file paths.
tests/opentelemetry-docker-tests/tests/docker-compose.yml	Switches to Collector Contrib image and bind-mounts the file exporter output directory into the collector.
tests/opentelemetry-docker-tests/tests/collector-config.yaml	Adds otlp_json_file/* receivers and includes them in each signal pipeline.
tests/opentelemetry-docker-tests/tests/.gitignore	Ignores the runtime-created file-output directory in docker tests.
.changelog/5412.added	Changelog entry for adding Docker tests for the OTLP JSON file exporter.

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