fix: Put Executor service into the application lookup

[denis-anisimov]

fixes vaadin/flow#9570

[vaadin-bot]

SonarQube analysis reported 14 issues

• 5 critical
• 3 major
• 6 minor

Top 10 extra issues

Note: The following issues were found on lines that were not modified in the pull request. Because these issues can't be reported as line comments, they are summarized here:

1. VaadinServletContextInitializer.java#L184: Move constants to a class or enum.
2. VaadinServletContextInitializer.java#L803: Refactor this method to reduce its Cognitive Complexity from 21 to the 15 allowed.
3. VaadinServletContextInitializer.java#L817: Refactor this code to not nest more than 3 if/for/while/switch/try statements.
4. VaadinServletContextInitializer.java#L824: Refactor this code to not nest more than 3 if/for/while/switch/try statements.
5. VaadinServletContextInitializer.java#L830: Refactor this code to not nest more than 3 if/for/while/switch/try statements.
6. VaadinServletContextInitializer.java#L197: Define and throw a dedicated exception instead of using a generic one.
7. VaadinServletContextInitializer.java#L412: Define and throw a dedicated exception instead of using a generic one.
8. VaadinServletContextInitializer.java#L463: Define and throw a dedicated exception instead of using a generic one.
9. VaadinServletContextInitializer.java#L701: Move this method into "RouteServletContextListener".
10. VaadinServletContextInitializer.java#L709: Move this method into "WebComponentServletContextListener".