feat(#2119): rename synthetic-reference.xsl -> scopes.xsl

[volodya-lombrozo]

Rename synthetic-reference.xsl transformation to scopes.xsl transformation and alias attribute to scope attribute.

Closes: #2119

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PR-Codex overview

This PR focuses on replacing the concept of aliases with scopes in the codebase.

Detailed summary

• Replaced alias with scope in code and comments
• Updated file and directory names related to aliases
• Updated XSL transformations related to aliases
• Updated tests and test resources related to aliases

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