Merge pull request #14165 from backstage/rugvip/basename

core: switch to using built-in base path in React Router v6 stable

.changeset/brave-eels-allow.md

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+---
+'@backstage/core-app-api': minor
+---
+
+Updated the React Router wiring to make use of the new `basename` property of the router components in React Router v6 stable. To implement this, a new optional `basename` property has been added to the `Router` app component, which can be forwarded to the concrete router implementation in order to support this new behavior. This is done by default in any app that does not have a `Router` component override.

.changeset/eleven-pets-sneeze.md

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+---
+'@backstage/core-plugin-api': minor
+---
+
+The app `Router` component now accepts an optional `basename` property.

.changeset/shaggy-colts-watch.md

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+---
+'@backstage/core-components': patch
+---
+
+Disable base path workaround in `Link` component when React Router v6 stable is used.