Add declare(strict_types=1) to all test traits

Closes #3401994

added 3 commits

• 72033d10 - Update formatting in PerformanceTestTrait
• 43716495 - Add phpcs rules
• 8ce89cee - Fix SchemaIntrospectionTestTrait

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added 1 commit

• 54d9e856 - CS nit.

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added 1 commit

• 56acda83 - Revert "Fix SchemaIntrospectionTestTrait" (to test Gitlab CI + phpcs)

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added 16 commits

• 56acda83...ba666c8d - 11 commits from branch project:11.x
• 3f6c1cc3 - Add declare(strict_types=1) to all test traits
• ef7b22e0 - Update formatting in PerformanceTestTrait
• b07e5bee - Add phpcs rules
• ca1d525f - Fix SchemaIntrospectionTestTrait
• f166690b - CS nit.

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added 2 commits

• e68d82dc - [#3401994]: Update the phpcs.xml to use spaces around the = sign
• 738a2db0 - [#3401994]: Re-run phpcbf to convert everything to use spaces around the =

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added 24 commits

• 738a2db0...7cb99a11 - 21 commits from branch project:11.x
• bcccb878 - Revert "[#3401994]: Re-run phpcbf to convert everything to use spaces around the ="
• f5399cd2 - Revert "[#3401994]: Update the phpcs.xml to use spaces around the = sign"
• 5bfa3b46 - Merge remote-tracking branch 'origin/11.x' into 3401994-strict-types-traits

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added 65 commits

• 5bfa3b46...fca86410 - 64 commits from branch project:11.x
• 27ccc67e - Merge 11.x HEAD.

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added 1 commit

• f67e8c8c - More traits

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resolved all threads

closed