Include `@code-pushup/eslint-config` in setup wizard

[matejchalk]

User story

The main advantage of integrating @code-pushup/eslint-plugin is that it allows setting a strict aspirational eslint.config.js, even though the current codebase isn't prepared to meet those standards. This gives users the opportunity to upgrade their ESLint config with a recommended set of strict rules. And we can suggest they include our @code-pushup/eslint-config package for this purpose.

Because @code-pushup/eslint-config supports a variety of different setups based on the user's tech stack, we should further prompt the user to select a subset of configs (the defaults may be inferred from their dependencies). Finally, we can modify their eslint.config.js and install missing ESLint plugins.

In fact, if the user has no ESLint config yet, we can create a full working configuration with @code-pushup/eslint-config.

Acceptance criteria

• The user is prompted (or provides a CLI argument) to opt in to using @code-pushup/eslint-config.
• The config setup logic is reused from the @code-pushup/create-eslint-config package - see Reusable setup wizard for @code-pushup/eslint-config eslint-config#45.
  • If they already have an eslint.config.js, then it is extended.
  • If they don't have an eslint.config.js yet, a new one is created.
  • The user is prompted (or provides a CLI argument) for a subset of configs to include.
    • The default selection is inferred from which packages the user has installed.
• Once the user opts in to using @code-pushup/eslint-config, we follow up with a prompt to disable failing rules (Disable failing ESLint rules in setup wizard #1260). In this case, the default is yes.