[PP-1][PHPUnit 10] @dataProvider methods must be declared static and public

Problem/Motivation

In PHPUnit 10, data provider methods that are not declared static yield deprecation errors in PHPUnit runs like

There were 2 PHPUnit deprecations:

1) Drupal\Tests\Core\Entity\EntityFieldManagerTest::testGetBaseFieldDefinitionsTranslatableEntityTypeDefaultLangcode
Data Provider method Drupal\Tests\Core\Entity\EntityFieldManagerTest::providerTestGetBaseFieldDefinitionsTranslatableEntityTypeDefaultLangcode() is not static

/var/www/html/core/tests/Drupal/Tests/Core/Entity/EntityFieldManagerTest.php:345

2) Drupal\Tests\Core\Entity\EntityFieldManagerTest::testGetBaseFieldDefinitionsTranslatableEntityTypeLangcode
Data Provider method Drupal\Tests\Core\Entity\EntityFieldManagerTest::providerTestGetBaseFieldDefinitionsTranslatableEntityTypeLangcode() is not static

/var/www/html/core/tests/Drupal/Tests/Core/Entity/EntityFieldManagerTest.php:382

Proposed resolution

Declare all data provider methods as static.

Remaining tasks

User interface changes

API changes

Data model changes

Release notes snippet