Remove Piwik support (#8835)

* Remove all mentions of Piwik

* Kill off all consumer of the old Piwik Analytics module

* Simplify ModalManager interface

* i18n

* Attempt to fix old e2e tests

* Remove unused component

* Iterate PR

src/Terms.ts

@@ -190,7 +190,7 @@ export async function dialogTermsInteractionCallback(
 ): Promise<string[]> {
     logger.log("Terms that need agreement", policiesAndServicePairs);
 
-    const { finished } = Modal.createTrackedDialog<[boolean, string[]]>('Terms of Service', '', TermsDialog, {
+    const { finished } = Modal.createDialog<[boolean, string[]]>(TermsDialog, {
         policiesAndServicePairs,
         agreedUrls,
     }, classNames("mx_TermsDialog", extraClassNames));