fix(ci): pin helm-unittest plugin version and bump chart-testing-action

[a7i]

Description

The Install Helm Unit Test Plugin step in the Helm CI workflow is failing with:

error unmarshaling JSON: while decoding JSON: json: unknown field "platformHooks"

This is caused by an incompatible change in the latest helm-unittest plugin release. This PR:

• Pins helm-unittest to v1.0.3 to avoid the breaking platformHooks field
• Bumps helm/chart-testing-action from v2.6.1 to v2.8.0

Checklist

• Code Readability: Is the code easy to understand, well-structured, and consistent with project conventions?
• Naming Conventions: Are variable, function, and structs descriptive and consistent?
• Code Duplication: Is there any repeated code that should be refactored?
• Function/Method Size: Are functions/methods short and focused on a single task?
• Comments & Documentation: Are comments clear, useful, and not excessive? Were comments updated where necessary?
• Error Handling: Are errors handled appropriately?
• Testing: Are there sufficient unit/integration tests?
• Performance: Are there any obvious performance issues or unnecessary computations?
• Dependencies: Are new dependencies justified?
• Logging & Monitoring: Is logging used appropriately (not too verbose, not too silent)?
• Backward Compatibility: Does this change break any existing functionality or APIs?
• Resource Management: Are resources (files, connections, memory) managed and released properly?
• PR Description: Is the PR description clear, providing enough context and explaining the motivation for the change?
• Documentation & Changelog: Are README and docs updated if necessary?

[Copilot]

Pull request overview

This PR fixes a CI failure in the Helm workflow caused by an incompatible change in the latest helm-unittest plugin release. The fix pins the helm-unittest plugin to a stable version and updates the chart-testing-action to a newer version.

Changes:

• Pins helm-unittest plugin to version 1.0.3 to avoid breaking changes in newer releases
• Updates chart-testing-action from v2.6.1 to v2.8.0

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