Fix yaml file indentation errors caught by yamllint

What does this MR do?

Fix yaml file indentation errors caught by yamllint

Since there are still many issues in yaml files, I didn't extend the yamllint test to all of them in this MR. May need to verify them locally.

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry for user-facing changes, or community contribution. Check the link for other scenarios.
• Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content