Include e2e on GDK in scheduled pipelines

What does this MR do and why?

In !117340 (merged) I accidentally excluded scheduled pipelines from the rules in qa:rules:e2e:test-on-gdk. This fixes that, and shares the if-force-ci condition too.

Scheduled pipelines should include jobs using .qa:rules:package-and-test-ee and .qa:rules:e2e:test-on-gdk. The only differences between the jobs/pipelines are that e2e:test-on-gdk can be excluded via the QA_RUN_TESTS_ON_GDK variable if necessary, and it runs automatically in MRs (whereas it's manual in MRs in package-and-test-ee).

We have too many rules 😞

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