Remove symlink files for libs.versions.toml in sub-sample projects

[fp024]

I specified the relative path of the root toml file in the settings.gradle file of each sub-example project.

This method ensures compatibility with non-Linux/UNIX OS environments where symbolic links are not available

The toml files in the following two examples are actual files, not symbolic links, so I excluded them:

• ./servlet/spring-boot/java/oauth2/resource-server/restclient/gradle/libs.versions.toml
• ./servlet/spring-boot/java/oauth2/restclient/gradle/libs.versions.toml

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• #300