🌱 (ci) Refactor alpha update E2E tests and increase coverage

[camilamacedo86]

• Refactored the alpha update test suite for clarity and modularity.
• Added validation for preserved custom code and go.mod dependencies.
• Improved version-specific assertions to avoid regressions.
• Increased e2e test coverage for v4.6.0 and v4.7.0 update paths.

Note that we are using the TestContext now. :-)

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Pull Request Overview

This PR refactors the alpha update E2E test suite to improve clarity, modularity, and test coverage. The changes focus on better test organization, enhanced validation, and streamlined test execution.

Key changes:

• Consolidated test setup by moving project initialization to BeforeEach hook
• Added comprehensive validation functions for Makefile content, go.mod dependencies, and preserved custom code
• Refactored alpha update test execution into a single parameterized function

[camilamacedo86]

@vitorfloriano could you please help on the review of this one?

[vitorfloriano]

LGTM.

The added validations for the Makefile and go.mod will help catch any errors in the merge logic.