fix(eslint): update linting ignore patterns

[daneah]

This change: (check at least one)

• Adds a new feature
• Fixes a bug
• Improves maintainability
• Improves documentation
• Is a release activity

Is this a breaking change? (check one)

• Yes
• No

Is the: (complete all)

• Title of this pull request clear, concise, and indicative of the issue number it addresses, if any?
• Test suite(s) passing?
• Code coverage maximal?
• Changeset added?
• Component status page up to date?

What does this change address?
ESLint was finding built files, when they existed, and not ignoring them. This issue was two-fold:

1. The patterns weren't right per ESLint's new expectation for relative and recursive patterns, so the files would be considered if present
2. The ignores were only configured in our main config, such that other plugins and so on would not use the list of ignores

How does this change work?
Updating the patterns and putting them in their own object at the start of the final config returns us to a fast, passing lint even in the presence of built files.

Additional context
Follows up #753

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Latest commit: 6798334

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[github-actions]

size-limit report 📦

Path	Size
packages/pharos/lib/index.js	64.56 KB (0%)