Docs: Make cluster management project requirement/prerequisite clearer
https://docs.gitlab.com/ee/user/clusters/applications.html#install-vault-using-gitlab-cicd
When using a link like the above, it is not immediately clear that adding a cluster management project is a prerequisite.
While this is listed as a prerequisite up above in the Usage section, this is not clear when people are browsing directly to #install-vault-using-gitlab-cicd
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Improve installation instructions to make this clearer -
Add a troubleshooting section that clarifies that a cluster management project must be created (these errors may result)
This came up in a support ticket where both engineers and the customer did not readily identify this prerequisite.
Link the doc and describe what is wrong with it.