feat: support specPattern, deprecate integrationFolder and componentFolder

[lmiller1990]

Documented here (Cypress team only): https://www.notion.so/cypressdx/testFiles-specPattern-glob-patterns-295d545a0af942ebb5b71eda2a6d422b

• deprecate testFiles, integrationFolder, component, superseded by specPattern, configurable on component and e2e

important this PR is really big since the concept of integrationFolder is sprinkled throughout the entire system. The main, important, and possibly breaking change is explained here: https://github.com/cypress-io/cypress/pull/19319/files#r765721951 please read this comment and ask if you have any concerns. @cowboy is the main person to talk to about this change in behavior.

Before

{
  integrationFolder: 'cypress/integration',
  testFiles: '**/*'
}

After

{
  e2e: {
    specPattern: 'cypress/integration/**/*',
  }
}

Scaffolding cypress/integration is gone

Our scaffolding logic is very closely tied to cypress/integration existing. Since we no longer scaffold by default on first use, instead using a visual wizard to let the user choose which specs they'd like to scaffold, I deleted all this code and relevant tests.

util/spec.ts is gone

Now using the findSpecs method in data-context, which does the same thing with much less indirection, not relying on integration or component folders any more, instead just using the new specPattern property. We only hit the file system once, then caching the specs in ctx.currentProject.specs, making it nice and quick.

Breaking change for @cypress/code-coverage

No integrationFolder is a breaking change for code coverage. I patched it locally to get CI passing for now: https://github.com/cypress-io/cypress/pull/19319/files#diff-84b549ff6d349070e8dfaf1b1713e4213274611342147dfcc2456848147d72f6. We will need to figure out the migration strategy here. Made an issue here.

Coming in future PR

• cypress/integration/**/* instead of cypress/e2e/**/*.cy.js
• update ignoreTestFiles to ignoreSpecPattern

As outlined in notion, we are changing the default directory for e2e from cypress/integration to cypress/e2e. Changing the default means changing all our projects in system-tests/projects (all 89 of them) and all the ones in npm. It's easy but adds a lot of noise to the PR. For this reason, I'll do those in a separate PR (WIP HERE).