feat: Display STF version in Web UI (#858)

* feat: Display STF version in Web UI

Adds the STF application version to the main menu in the Web UI.

Changes:
- Modified `lib/units/app/index.js` to read the version from `package.json` and make it available to the frontend via the `GLOBAL_APPSTATE.config.stfVersion` variable.
- Updated `res/app/menu/menu.pug` to display this version in the top navigation bar, near the help icon. The format is "vX.Y.Z".
- Added an E2E test (`res/test/e2e/menu/menu-spec.js`) to verify the presence and correct format of the version string in the UI.

Signed-off-by: matanbaruch <matan.baruch@unity3d.com>

* Update menu-spec.js

Signed-off-by: matanbaruch <matan.baruch@unity3d.com>

* fix: lint

Signed-off-by: matanbaruch <matan.baruch@unity3d.com>

* feat: Add application state to root scope and style version text in menu

- Introduced a new run block in `app.js` to attach the application state to the `$rootScope`.
- Added CSS styles for the version text in the menu to enhance its visibility and layout.

Signed-off-by: matanbaruch <matan.baruch@unity3d.com>

* fix: Correct path to package.json in index.js

Updated the import statement for package.json in lib/units/app/index.js to use the correct relative path, ensuring proper access to the application version information.

Signed-off-by: matanbaruch <matan.baruch@unity3d.com>

---------

Signed-off-by: matanbaruch <matan.baruch@unity3d.com>
Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>

res/app/menu/menu.css

@@ -70,6 +70,17 @@
   min-height: 44px !important;
 }
 
+.stf-menu .version-text {
+  display: inline-block;
+  font-size: 14px;
+  line-height: 44px;
+  color: #777777;
+  font-weight: 400;
+  padding: 0 10px;
+  text-align: center;
+  vertical-align: middle;
+}
+
 .stf-menu .information-level {
   background-color: #5bc0df;
 }