[WIP] Refactor lazylog-custom-styles.css to avoid !important

[Copilot]

Plan to avoid CSS !important syntax

• Understand the problem: The @melloware/react-logviewer package uses CSS modules with embedded styles
• Analyze CSS specificity requirements to override package styles
• Modify lazylog-custom-styles.css to use higher specificity selectors instead of !important
• Add .treeherder-lazylog-wrapper class to component wrappers for higher specificity
• Update imports in LogviewerTab.jsx to use new package
• Test the changes to verify styles are applied correctly (linting and build pass)
• Run linters and ensure code quality

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