[hotfix] docs(product-console): add v2.4 upgrade guide

[gandalf-at-lerian]

Summary

• Adds the retroactive minor upgrade guide for product-console from 2.3.1-beta.1 to 2.4.0-beta.1.
• Patch-only upgrade docs remain ignored, per task scope.

Requested by: @guimoreirar

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📥 Commits

Reviewing files that changed from the base of the PR and between 3766751 and 29392e9.

📒 Files selected for processing (1)

• charts/product-console/docs/UPGRADE-2.4.md

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