feat: add update-che-e2e-tests command for automated e2e test fixes

[olexii4]

Is your enhancement related to a problem? Please describe

Summary

Add an /che-ai-assistant update-che-e2e-tests bot command that automatically creates e2e fix PRs for eclipse-che/che when dashboard changes break UI locators.

Problem

Dashboard PRs sometimes change aria-labels, data-testids, or other selectors that e2e tests in eclipse-che/che rely on. Tracking that down currently requires:

1. Reading the dashboard diff manually
2. Grepping tests/e2e/pageobjects/ for the old values
3. Patching the locator methods by hand
4. Opening a follow-up PR in eclipse-che/che

This is repetitive and easy to miss.

Example: eclipse-che/che-dashboard#1544 changed:

aria-label="Actions"  →  aria-label="Actions for ${workspace.name}"

That broke getActionsLocator() and getExpandedActionsLocator() in
tests/e2e/pageobjects/dashboard/Workspaces.ts. The fix had to be tracked and applied manually in eclipse-che/che#23830.

Describe the solution you'd like

Proposed solution

A new bot subcommand triggered by commenting on a dashboard PR:

/che-ai-assistant update-che-e2e-tests

The command starts a DevWorkspace with Claude Code, which:

1. Reads the dashboard PR diff to identify changed selectors (aria-labels, data-testids, CSS classes, button text)
2. Searches tests/e2e/pageobjects/ in eclipse-che/che for page objects using the old values
3. Patches the affected locator methods
4. Opens a draft PR in eclipse-che/che and posts the URL back as a comment on the dashboard PR

Implementation scope

File	Change
pkg/commands/commands.go	Add SubCommandUpdateCheE2ETests constant and register in SubCommands slice
templates/update-che-e2e-tests.tmpl	Prompt template guiding the DevWorkspace Claude session
pkg/handlers/update_che_e2e_tests_handler.go	Parse the created PR URL from Claude output, post it as a comment
pkg/handlers/update_che_e2e_tests_handler_test.go	Unit tests for URL parsing
pkg/processor/processor.go	Wire the handler into the command dispatch map
README.md	Document the new command and CHE_AI_ASSISTANT_E2E_GITHUB_TOKEN env var

Describe alternatives you've considered

No response

Additional context

No response

[olexii4]

fixed with che-incubator/che-ai-assistant#4