1. '-Wctad-copy-not-wrap' warns when copy deduction candidate is selected in CTAD, and the initialization is a direct-initialization. The warning is suppressed when the class template is in a system header and has at least one explicit deduction guide. 2. Add a group '-Wctad' which incldues '-Wctad-copy-not-wrap' and '-Wctad-maybe-unsupported'. Fixes #63288

1. '-Wctad-selects-copy' warns when copy deduction candidate is selected in CTAD, and the initialization is a direct-initialization. The warning is suppressed when the class template is in a system header and has at least one explicit deduction guide. 2. Add a group '-Wctad-maybe-unintended' controlling '-Wctad-selects-copy' and '-Wctad-maybe-unsupported'. Fixes #63288

1. '-Wctad-copy-not-wrap'selects-copy' warns when copy deduction candidate is selected in CTAD, and the initialization is a direct-initialization. The warning is suppressed when the class template is in a system header and has at least one explicit deduction guide. 2. Add a group '-Wctad' which incldues-maybe-unintended' controlling '-Wctad-copy-not-wrap' andselects-copy' and '-Wctad-maybe-unsupported'. Fixes #63288