docs: explain globalSetup/setupFiles and add Lifecyle page

[sheremet-va]

Description

Resolves #issue-number

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[Copilot]

Pull request overview

This PR adds comprehensive documentation about Vitest's test run lifecycle and improves existing documentation for globalSetup and setupFiles configuration options.

• Adds a new "Test Run Lifecycle" guide page explaining all phases of a Vitest test run from initialization to teardown
• Enhances globalSetup documentation with clearer examples and better structure
• Improves setupFiles documentation to clarify execution context and relationship to other lifecycle phases

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
docs/guide/lifecycle.md	New comprehensive guide covering all 7 phases of the test lifecycle with examples, tables, and cross-references
docs/config/setupfiles.md	Enhanced with clearer explanations of execution context, timing, and differences from globalSetup
docs/config/globalsetup.md	Improved with better code examples, added section on onTestsRerun hook, and clarified scope differences
docs/config/sequence.md	Minor improvement to clarity of phrasing about test dependencies
docs/.vitepress/config.ts	Added navigation entry for new lifecycle guide and expanded Advanced sections