`cozy-client` has been upgraded to `49.0.0` in order to retrieve the
Offline mode support

`cozy-intent` has been upgraded to `2.23.0` as it is the new minimal
version for `cozy-client` since `49.0.0`

Related PR: cozy/cozy-client#1507

`cozy-device-helper` has been upgraded to `3.1.0` in order to retrieve
the Offline mode support

Related PR: cozy/cozy-libs#2562

`cozy-harvest-lib` has been upgraded to `30.0.1` in order to retrieve a
fix on accounts fetching that provide support for Offline mode

Related PR: cozy/cozy-libs#2585

`cozy-viewer` has been upgraded to `2.0.0` in order to retrieve changes
on how files are downloaded in order to handle Offline mode

Related PR: cozy/cozy-libs#2581

`cozy-bar` has been upgraded to `15.0.1` in order to retrieve a fix
related to Offline mode

Related PR: cozy/cozy-bar#852

We want mespapiers to be compatible with the new Flagship app's Offline
mode

When hosted in a Flagship app's WebView we now want to use FlagshipLink
instead of StackLink in cozy-client

This link will allow to redirect all queries to the Flagship app that
will handle data access when offline but also when online

Related PR: cozy/cozy-client#1507
Related PR: cozy/cozy-flagship-app#1239

Previous query was not compatible with CozyPouchLink

In cozy/cozy-client#1518 we implemented a new `downloadFile()` that
allow to download files as before in a browser, but will download files
through cozy-intent when hosted in the Flagship app

This commit will replace the old way to download files with the new one
using `downloadFile()`

Related PR: cozy/cozy-client#1536

When offline, the PouchDB result does not contain a `referenced_by`
attribute if no relationship exists on the document. So we want to
optional chain this attribute to prevent any exception thrown

Related Commit: cozy/cozy-ui@e3eeb6e