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#2393: open a project folder (--project) instead of the main workspace (#2565)

* #2491: add --project flag with path resolution/validation and getOpenPath() foundation

Introduces an optional --project flag on IDE launch commands (e.g. `ide intellij
--project <path>`). The flag is consumed by IDEasy and never passed through to the
IDE binary; its value becomes the folder the IDE opens.

Key parts:
- getOpenPath() is the single source of truth for "which folder does this launch
  open?": the explicit --project folder when given (relative paths resolved against
  the current working directory), otherwise getWorkspacePath() (today's default).
- A launch with a missing or not-a-folder --project path aborts with a clear error
  and the IDE is not started.
- extractProjectOption() strips the flag from the trailing passthrough args, which
  the framework would otherwise forward verbatim to the IDE binary.

Default (no-flag) behavior is unchanged.

* #2492: open the folder given by getOpenPath() in IntelliJ/VS Code launch args

Point the IDE launch-argument seams at getOpenPath() (sub-task #2 of #2393)
instead of getWorkspacePath(), so a launch with an explicit --project flag opens
exactly that folder:

- IdeaBasedIdeToolCommandlet.runTool appends getOpenPath() (covers all JetBrains /
  IDEA-based commandlets: IntelliJ, Android Studio, PyCharm, via the shared base).
- Vscode.configureToolArgs appends getOpenPath(); --user-data-dir / --profile stay
  on the main profile (sharing is decided behavior per #2393).

Without a --project flag getOpenPath() falls back to getWorkspacePath(), so the
default (main workspace) behavior is unchanged. Eclipse is left out (different
workspace model). Supersedes the no-flag CWD approach of #2434 / #2236.

Tests (AssertJ):
- IntelliJ with --project -> launch args target the selected folder, not the workspace.
- VS Code with --project -> configureToolArgs appends the folder; profile stays on main.
- VS Code no-flag -> configure... (continued)

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