fix(linter): generate flat config for new projects correctly

[leosvelperez]

• Change generated import for FlatCompat:

  - const FlatCompat = require('@eslint/eslintrc');
  + const { FlatCompat } = require('@eslint/eslintrc');

• Fix replacing overrides to be reflected in the end result (the updated content with the replacements was not being assigned)
• Add extended plugins/configs to the start (matches behavior of the old config)

Current Behavior

Expected Behavior

Related Issue(s)

Fixes #22350
Fixes #26151

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1 Ignored Deployment

Name	Status	Preview	Updated (UTC)
nx-dev	⬜️ Ignored (Inspect)	Visit Preview	Jun 4, 2024 7:42am

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• nx affected --targets=e2e,e2e-ci --base=0594debfef05fd3727e5f7cc257628647f6056b6 --head=93a99b575e91af066f9824d9cfa1b4847c69fb0c --parallel=1
• nx affected --targets=lint,test,build --base=0594debfef05fd3727e5f7cc257628647f6056b6 --head=93a99b575e91af066f9824d9cfa1b4847c69fb0c --parallel=3
• nx run-many -t check-imports check-commit check-lock-files check-codeowners documentation --parallel=1 --no-dte
• nx-cloud record -- nx format:check --base=0594debfef05fd3727e5f7cc257628647f6056b6 --head=93a99b575e91af066f9824d9cfa1b4847c69fb0c
• nx documentation --no-dte
• nx affected -t e2e-macos-ci --parallel=1 --base=0594debfef05fd3727e5f7cc257628647f6056b6 --head=93a99b575e91af066f9824d9cfa1b4847c69fb0c

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