🔥 Cleanup: Remove unused templates and simplify signatures

[MadsBogeskov]

Problem

After completing the Stencil template migration (IOS-427 through IOS-434), some unused artifacts and dead code remain in the codebase.

Solution

• Delete unused DummyTest.stencil template (not referenced anywhere)
• Remove unused swaggerFile and accessControl parameters from GlobalHeadersModel.toSwift() — these were leftover from before the Stencil migration and are not used in the method body
• Remove unused import SwaggerSwiftML from GlobalHeadersModel.swift

Note: The Static Files/ directory was already removed in PR #170. Helpers like indentLines(), addNewlinesIfNonEmpty(), and documentationFormat() are still actively used for building pre-rendered body strings passed to Stencil templates, so they are intentionally kept.

Testing

All 70 tests pass, including golden file tests (byte-for-byte identical output).

Stack

#169 → #170 → #171 → #172 → #173 → #174 → #175 → #176 → #177 → this PR

IOS-435

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Note

Low Risk
Low risk cleanup that only removes unused template code and drops unused parameters/imports in GlobalHeadersModel.toSwift(), with minimal behavioral impact aside from a signature change.

Overview
Removes dead Stencil scaffolding by deleting the unused DummyTest.stencil template.

Simplifies GlobalHeadersModel.toSwift() by dropping unused swaggerFile/accessControl parameters and removing an unused SwaggerSwiftML import, updating Generator to call the new signature when emitting GlobalHeaders.swift.

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