Add basic docs about cross-project pipeline triggers
What does this MR do?
Docs for https://gitlab.com/gitlab-org/gitlab-ee/issues/8997
Related issues
https://gitlab.com/gitlab-org/gitlab-ee/issues/8997
Author's checklist
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Apply the correct labels and milestone -
Crosslink the document from the higher-level index -
Crosslink the document from other subject-related docs -
Feature moving tiers? Make sure the change is also reflected in features.yml
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Correctly apply the product badges and tiers
Review checklist
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Your team's review (required) -
PM's review (recommended, but not a blocker) -
Technical writer's review (required) -
Merge the EE-MR first, CE-MR afterwards
Edited by Evan Read