Change `IS_GITLAB_EE` to `FOSS_ONLY`
What does this MR do?
This removes the usage of IS_GITLAB_EE and prefer to use FOSS_ONLY that has the following states:
- nil/empty string: use CE or EE depending on sources
- false: use CE or EE depending on sources
- true: use CE always
This follows the discussion in: #33875 (closed)
Does this MR meet the acceptance criteria?
Conformity
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Changelog entry -
Documentation created/updated or follow-up review issue created -
Code review guidelines
Closes: #33875 (closed)
Edited by 🤖 GitLab Bot 🤖