Deprecate inject_ci option in favor of inject_policy

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Description

With the introduction of custom stages in pipeline execution policies (available in GitLab 17.9), we’ve introduced the configuration option inject_policy to replace the deprecated inject_ci.

This new strategy allows for a graceful rollout of the custom stages functionality for users with existing pipeline execution policies that use the inject_ci strategy.

To prepare for the 19.0 removal, update all pipeline execution policies that use inject_ci to use inject_policy instead.