ROU-12911: Migrate scss @import into @use/@forward

[joselrio]

This pull request completes the migration of all SCSS partials from @import to the modern @use/@forward syntax, updates the SCSS build pipeline to reflect this change, and makes several related improvements and cleanup tasks. It also bumps gulp to v5 and adds sass-migrator as a dev dependency. Minor code formatting and consistency changes are included in TypeScript files.

SCSS Build Pipeline and Structure Modernization:

• All SCSS partials now use @use/@forward instead of @import, and the code generation logic in GetPartialsList.js and CreateScssFile.js has been updated to emit @use ... as *; statements, ensuring namespace collision avoidance and correct comment placement. [1] [2] [3] [4] [5] [6]
• The "Functions & Mixins" section has been merged into the setup variables section. The corresponding file and references (Functions&Mixins.js) have been removed and its path is now included in SetupVariables.js as part of a new barrel file. [1] [2] [3] [4]
• The SCSS build now emits the abstracts barrel @use as the very first statement in the generated entry file to avoid Dart Sass comment duplication issues. [1] [2]

Build Tooling Updates:

• Upgrades gulp to v5 and adds sass-migrator as a dev dependency to support and enforce the new SCSS module system. [1] [2]
• Removes 'import' from the list of silenced Dart Sass deprecation warnings, since all first-party SCSS has migrated away from it.

Code Formatting and Minor Cleanups:

• Improves code formatting for readability and consistency in several TypeScript files, including better line breaks for multi-line statements and minor string fixes. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10]

These changes ensure the codebase is fully up to date with modern Sass best practices, reduce technical debt, and improve maintainability going forward.

[BenOsodrac]

@joselrio great work on this, code-wise don't anything wrong, lets just align on the merge topic!

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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