OEL-1147: Remove footer pattern, layouts and extra blocks.

templates/layouts/ec_footer_bottom_left.html.twig

templates/layouts/ec_footer_bottom_middle.html.twig

templates/layouts/ec_footer_bottom_right.html.twig

templates/layouts/ec_footer_middle_row.html.twig

templates/layouts/eu_footer_left.html.twig

templates/layouts/eu_footer_middle.html.twig

templates/layouts/eu_footer_right.html.twig

templates/layouts/footer_top_left.html.twig

templates/layouts/footer_top_middle.html.twig

templates/layouts/footer_top_right.html.twig

...navigation/block--oe-corporate-blocks-ec_footer.html.twig

...navigation/block--oe-corporate-blocks-eu_footer.html.twig

templates/patterns/footer/footer.ui_patterns.yml

...ates/patterns/footer/pattern-footer--variant-ec.html.twig

...ates/patterns/footer/pattern-footer--variant-eu.html.twig