Tests/admin/wpThemeInstallListTable: rename the original test class

[himanshupathak95]

Trac ticket: https://core.trac.wordpress.org/ticket/65208

Rename the test class Tests_Admin_wpThemeInstallListTable to Admin_WpThemeInstallListTable_GetViews_Test so that the name includes both the class under test and the method being tested.

Moves the @covers annotation to the class level and removes the duplicate method-level annotation. This makes the test class compatible with PHPUnit 11.

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