[ML] Switch from `HashRouter` to platform-provided `BrowserRouter`

[walterra]

Currently the ML plugin uses HashRouter for routing. We should switch over to the platform-provided BrowserRouter in order to be consistent with other apps and be able to handle query params better.

Docs: https://www.elastic.co/guide/en/kibana/current/breaking-changes-7.7.html#_add_scopedhistory_to_appmountparams

Todos

• Migrate HashRouter to BrowserRouter (Note we import Router but that's actually BrowserRouter). [ML] Migrate to React BrowserRouter and Kibana provided History. #71941
• Migrate breadcrumbs away from hash based URLs. [ML] Migrate to React BrowserRouter and Kibana provided History. #71941
• Fix analytics list in management page [ML] Fix analytics list on management page. #74254
• Migrate internal URLs using # to use URLs using base path. [ML] Extend MlUrlGenerator to support other ML pages #75696 [ML] Migrate internal urls to non-hash paths #76735
• Migrate external URLs using # to use URLs using base path. [ML][Meta] Migrate ML urls to non-hash paths for non-ML plugins #76039
• Improve breadcrumbs for settings page, introduce another level like Settings - Filter lists - Create
• Fix clicking on breadcrumb when opening link in a new tab
• Fix "Open in Anomaly Explorer" table action link on the AD jobs page that causes a full page refresh
• Fix "Start trial" link on Data Visualizer page when running with Basic license

[elasticmachine]

Pinging @elastic/ml-ui (:ml)

[darnautov]

Browser's history seems broken now. No matter which URL you navigate within ML app - the history gets replaced so the browser back button doesn't work as expected.

[qn895]

Found an issue where clicking the breadcrumb works correctly but opening a new tab using the breadcrumb won’t yield the correct link.
E.g. Anomaly Detection will give http://localhost:5601/jobs instead of http://localhost:5601/app/ml/jobs

[qn895]

Saw this issue where it was working correctly in 7.9 but not any more on main.

Fix the call out link to the index management page not going to the right path. Currently it will go to app/ml/data_frame_analytics/management/kibana/indexPatterns instead of app/management/kibana/indexPatterns

Just adding this note in just case so we can do check on other EuiLink components where href is used for linking to other apps in Kibana.