Add TS_IDE_START_TIMEOUT constant and Claude Code configuration

[dmytro-ndp]

What does this PR do?

1. Add TS_IDE_START_TIMEOUT constant - New timeout for IDE startup in TIMEOUT_CONSTANTS.ts, which helps to handle The workspace status remains "Starting" in the last 300 seconds start workspace error:

Test run, which handled error correctly: https://jenkins-csb-crwqe-main.dno.corp.redhat.com/job/Testing/job/e2e/job/basic/job/typescript-tests/51649/consoleFull

All functional test run: https://jenkins-csb-crwqe-main.dno.corp.redhat.com/job/Testing/job/e2e/job/complex/job/latest/job/functional-tests/2522/

2. Add Claude Code AI assistant configuration for E2E test development:

• CLAUDE.md - Project instructions and quick reference
• /e2e-test-developer skill - Code style, patterns, and best practices guidance
• /run-e2e-test command - Unified test runner for Che/Dev Spaces (local or Podman)

Screenshot/screencast of this PR

N/A

What issues does this PR fix or reference?

CRW-10034

How to test this PR?

Timeout constant:

• Run E2E tests that use TS_IDE_START_TIMEOUT (e.g., SmokeTest with )

Claude Code configuration:

1. Install Claude Code CLI
2. Run claude in tests/e2e/ directory
3. Test skills: /e2e-test-developer, /run-e2e-test

PR Checklist

• The Eclipse Contributor Agreement is valid
• Code produced is complete
• Code builds without errors
• Tests are covering the bugfix or new feature
• The repository devfile is up to date and works
• Sections What issues does this PR fix or reference and How to test this PR completed
• Relevant user documentation updated
• Relevant contributing documentation updated
• CI/CD changes implemented, documented and communicated