Blockbase Children: remove conflicting `core/navigation-link` styles (#7029)

Prior to this, `core/navigation-link` styles would always override the parent nav block's color

Fixes https://github.com/Automattic/wp-calypso/issues/74984

geologist/theme.json

@@ -199,12 +199,6 @@
 					"lineHeight": "1.6"
 				}
 			},
-			"core/navigation-link": {
-				"color": {
-					"background": "transparent",
-					"text": "var(--wp--custom--color--foreground)"
-				}
-			},
 			"core/post-title": {
 				"typography": {
 					"fontSize": "min(max(3rem, 7vw), 4rem)",

quadrat/theme.json

@@ -210,12 +210,6 @@
 					"fontSize": "var(--wp--custom--font-size--normal)"
 				}
 			},
-			"core/navigation-link": {
-				"color": {
-					"background": "transparent",
-					"text": "var(--wp--custom--color--foreground)"
-				}
-			},
 			"core/post-title": {
 				"typography": {
 					"fontSize": "min(max(3rem, 7vw), 5rem)",

videomaker/theme.json

@@ -96,12 +96,6 @@
 	},
 	"styles": {
 		"blocks": {
-			"core/navigation-link": {
-				"color": {
-					"background": "transparent",
-					"text": "var(--wp--custom--color--foreground)"
-				}
-			},
 			"core/post-date": {
 				"typography": {
 					"fontSize": "var(--wp--preset--font-size--small)"

zoologist/theme.json

@@ -204,12 +204,6 @@
 					"fontSize": "var(--wp--custom--font-size--normal)"
 				}
 			},
-			"core/navigation-link": {
-				"color": {
-					"background": "transparent",
-					"text": "var(--wp--custom--color--foreground)"
-				}
-			},
 			"core/post-title": {
 				"spacing": {
 					"margin": {