Tests/admin/wpTermsListTable: rename the original test class

[himanshupathak95]

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

Rename the test class Tests_Admin_WpTermsListTable to Admin_WpTermsListTable_HandleRowActions_Test so that the name includes both the class under test (WP_Terms_List_Table) and the method being tested (handle_row_actions).

Both existing test methods already covered the same production method, so no splitting was required. Consolidates the repeated method-level @covers WP_Terms_List_Table::handle_row_actions annotations into a single class-level declaration. This is cleaner and compatible with PHPUnit 11.

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