Add version 12 upgrade recommendations

What does this MR do?

Upgrade recommendations contain suggested upgrade paths and examples, stopping with version 11.3.4

MR adds documentation for upgrade path to latest major version (12.x):

11.3.4 -> 11.11.x -> 12.0.x

Fix #63907 (closed)

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides