#SBCOSS-625: Textbook collection update upon csv update

[Rakshitha-D]

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Test Configuration:

• Software versions: Java 11, scala-2.12, play-2.7.2
• Hardware versions: 2 CPU/ 4GB RAM

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[Copilot]

Pull Request Overview

Updates collection CSV handling to correctly classify child nodes by their own content type and adds an explicit return type to a validator.

• Check child node contentType instead of parent when building unitChildren and linkedContents
• Add explicit Unit return type to validateCollection method

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