fix: add @calcom/eslint-plugin to base ESLint config

[hariombalhara]

What does this PR do?

Fixes the ESLint warning in packages/embeds/embed-core/src/embed.ts where the rule @calcom/eslint/no-scroll-into-view-embed was not found.

The issue was that the @calcom/eslint-plugin-eslint package exists and contains the rule, but it wasn't imported and configured in the base ESLint configuration that all packages inherit from.

Changes:

• Added @calcom/eslint-plugin-eslint as a workspace dependency to the eslint-config package
• Imported and configured the plugin in packages/eslint-config/base.js
• Added the specific no-scroll-into-view-embed rule that was causing the warning

How should this be tested?

Verify the fix:

1. Run npx eslint packages/embeds/embed-core/src/embed.ts from the root directory
2. Confirm that the previous warning "Definition for rule '@calcom/eslint/no-scroll-into-view-embed' was not found" no longer appears
3. Run yarn lint:report to ensure no regressions across all packages
4. Run yarn type-check:ci --force to verify no type issues were introduced

Expected behavior:

• ESLint should recognize the @calcom/eslint/no-scroll-into-view-embed rule
• The rule should properly validate usage of scrollIntoView in embed contexts
• No other ESLint or type checking errors should be introduced

Mandatory Tasks (DO NOT REMOVE)

• I have self-reviewed the code (A decent size PR without self-review might be rejected).
• I have updated the developer docs in /docs if this PR makes changes that would require a documentation change. If N/A, write N/A here and check the checkbox. N/A - this is an internal ESLint configuration fix
• I confirm automated tests are in place that prove my fix is effective or that my feature works. Verified via ESLint execution and lint:report

Review Focus Areas

Key things to verify:

• ESLint plugin import syntax is correct in base.js
• Plugin namespace "@calcom/eslint" matches the usage in embed.ts disable comments
• Workspace dependency addition is appropriate for monorepo structure
• No unintended side effects on other packages that inherit from base ESLint config

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Requested by: @hariombalhara

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✨ Finishing touches

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• Create PR with unit tests
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• Commit unit tests in branch devin/1758884558-fix-eslint-plugin-config

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