chore: harden vscode_run_command for selenium CI (#2712)

## Summary

Harden Selenium command-palette usage in `vscode_run_command` so Linux
UI CI stops failing when the palette stays open or Enter races the
filtered list.

## Changes

- Escape before opening the palette (clear leftover overlay).
- Short wait after typing before Enter.
- Slightly longer wait for the quick-input field (`click_and_wait` 1s →
2s).

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

Hardened the `vscode_run_command` helper function to prevent Linux UI CI
failures when using VSCode's command palette. The changes improve
resilience by clearing leftover overlay state before opening the
palette, waiting before executing commands to reduce timing issues, and
increasing the input field timeout.

- Send ESCAPE keystroke via ActionChains before opening the palette to
clear any leftover overlay state
- Wait briefly after clicking/focusing the command input field before
continuing
- Increase `click_and_wait` timeout for the quick-input field from 1 to
2 seconds
- Add 0.5 second sleep after typing the command and before pressing
ENTER to reduce race conditions

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: rockygeekz

test/ui/utils/ui_utils.py

@@ -1020,6 +1020,12 @@ def vscode_run_command(
     driver.switch_to.default_content()
     if not command.startswith(">"):
         command = ">" + command
+
+    # Dismiss any leftover palette/dialog from a previous call to avoid
+    # blocking the command-center click with an overlay.
+    ActionChains(driver).send_keys(Keys.ESCAPE).perform()
+    time.sleep(0.3)
+
     # click the command box
     max_attempts = 6  # we seen timeout issue on GHA with 4 seconds
     command_input = None
@@ -1033,7 +1039,7 @@ def vscode_run_command(
                 driver,
                 command_box,
                 "//input[@aria-controls='quickInput_list']",
-                timeout=1,
+                timeout=2,
             )
             break
         except (
@@ -1048,7 +1054,9 @@ def vscode_run_command(
 
     if command_input:
         command_input.send_keys(command)
-    # enter
+        # Let the palette finish filtering results before pressing Enter,
+        # otherwise the keystroke can arrive before a match is highlighted.
+        time.sleep(0.5)
     actions = ActionChains(driver)
     actions.send_keys(Keys.ENTER).perform()
     if command_param: