Update dataProvider Methods to static for PHPUnit 10 Compatibility

Cherry-picked @chandu7929 the commit from 📌 Automated Drupal 11 compatibility fixes for scheduler Active .

Verified this and its working fine

Hi @jonathan1055
Can you review/merge the changes as I've rebased now with 📌 Gitlab PHPunit job at Next Major needs D11-compatible test dependencies Fixed .
Thanks.

In due course, yes. You do't need to prompt me :)
I am working on 📌 Call to undefined method getName when running PHPUnit tests on Drupal 11 Fixed and 📌 Remove default_argument_skip_url key from view configurations Fixed
The other main problem is 📌 Fix: The update to convert "numeric" arguments to "entity_target_id" is deprecated Needs review

Previous tests had

Data Provider method Drupal\Tests\scheduler\Functional\SchedulerDefaultTimeTest::dataStandardEntityTypes() is not static

All of these errors have been removed with the MR

Accesing $this in data providers is no longer allowed, so these have been replaced with self::dataStandardEntityTypes(). The only place where hardcoded entity types have been used is in the definition of the two functions. There is no simple way round this, so we accept that this is duplicated hard-coding.

Thanks. Merged and fixed

The credit I gave in #9 also got lost, so re-doing that too.

Automatically closed - issue fixed for 2 weeks with no activity.

I also did the equivalent for 8.x-1.x
https://git.drupalcode.org/project/scheduler/-/commit/b7674877fb2289b082...