Move RenderSVGResourceContainer into legacy and rename it. A new RenderSVGResourceContainer will be introduced soon for the new LBSE resource concept.
Pull request: https://github.com/WebKit/WebKit/pull/17914
Committed 268196@main (789a2cd2bfb7): <https://commits.webkit.org/268196@main> Reviewed commits have been landed. Closing PR #17914 and removing active labels.
<rdar://problem/115779818>