WIP: add otel baggage php endpoints

[rachelyangdog]

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[github-actions]

CODEOWNERS have been resolved as:

utils/build/docker/php/common/otel_drop_in_baggage_api_otel.php         @DataDog/apm-php @DataDog/system-tests-core
manifests/php.yml                                                       @DataDog/apm-php @DataDog/asm-php
tests/test_baggage.py                                                   @DataDog/system-tests-core
utils/build/docker/php/apache-mod/php.conf                              @DataDog/apm-php @DataDog/system-tests-core
utils/build/docker/php/common/composer.json                             @DataDog/apm-php @DataDog/system-tests-core
utils/build/docker/php/php-fpm/php-fpm.conf                             @DataDog/apm-php @DataDog/system-tests-core

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Add PHP handler for /otel_drop_in_baggage_api_datadog

The rewrite enables the /otel_drop_in_baggage_api_datadog route, but a repo-wide search shows there is no corresponding PHP handler under utils/build/docker/php/common/ (only otel_drop_in_baggage_api_otel.php was added). That means the route will 404 in the PHP weblog, so Test_Baggage_Headers_Api_Datadog will fail once it’s enabled. Please add the PHP handler or keep the test skipped for PHP until it exists.

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[chatgpt-codex-connector]

Require Composer autoload before using OTel API

otel_drop_in_baggage_api_otel.php uses OpenTelemetry\API\Baggage\Baggage but never includes vendor/autoload.php. In this repo, other PHP endpoints that use Composer deps explicitly require the autoloader (e.g., log-library.php), so this endpoint will fatally error with “Class not found” and return 500. Add the autoload include at the top of the file.

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