[security_solution] Fix @grep tags in Cypress (#164644)

## Summary

`@cypress/grep` is just reading the file as text, so it's not capable of
evaluating the variables, because of that, today we are running all the
spec files, and that means that we are setting up a new stack just to
stop it a few seconds later after grep skips the spec file

https://github.com/cypress-io/cypress/blob/develop/npm/grep/src/plugin.js#L117

With variable:
<img width="1219" alt="Zrzut ekranu 2023-08-23 o 23 06 30"
src="97b6fdaa-a03a-4a4f-bbdc-97da8e1788ce">

With string:
<img width="2074" alt="Zrzut ekranu 2023-08-23 o 23 06 04"
src="1f48d20a-3a1a-4ded-aa47-493781a4758b">

---------

Co-authored-by: kibanamachine <42973632+kibanamachine@users.noreply.github.com>

typings/index.d.ts

@@ -22,3 +22,4 @@ declare module 'monaco-editor/esm/vs/basic-languages/css/css';
 declare module 'monaco-editor/esm/vs/basic-languages/yaml/yaml';
 
 declare module 'find-cypress-specs';
+declare module '@cypress/grep/src/plugin';