feat(cnsl): docs link can be customized and custom button is available (#7840)

* feat: customize doc link and additional custom link

* feat: add e2e tests

* fix: update docs

* fix: add @peintnermax changes about cache

* fix: golangci-lint complains preparation.PrepareCommands

---------

Co-authored-by: Max Peintner <max@caos.ch>

internal/domain/policy_privacy.go

@@ -10,8 +10,11 @@ type PrivacyPolicy struct {
 	State   PolicyState
 	Default bool
 
-	TOSLink      string
-	PrivacyLink  string
-	HelpLink     string
-	SupportEmail EmailAddress
+	TOSLink        string
+	PrivacyLink    string
+	HelpLink       string
+	SupportEmail   EmailAddress
+	DocsLink       string
+	CustomLink     string
+	CustomLinkText string
 }