[jenkins] Cache result of check upgrade

Update sabre/dav to 2.1.7

[upgrade] switch to debug logging on upgrade

reduce calls of \OCP\Util::needUpgrade()
where \OCP\Util::needUpgrade() is called we can call as well
self::checkUpgrade and use the cached result
In line 877 the call way unnecessary anyway because of the first part of
the if statement

move caching to \OCP\Util::needUpgrade

renaming variable

fixing testNeedUpgradeCore()

cache result of checkUpgrade() in self::$needUpgrade

reduce calls of \OCP\Util::needUpgrade()
where \OCP\Util::needUpgrade() is called we can call as well
self::checkUpgrade and use the cached result
In line 877 the call way unnecessary anyway because of the first part of
the if statement

move caching to \OCP\Util::needUpgrade

renaming variable

fixing testNeedUpgradeCore()

fix typo in variable name

deleting tabs

Add blob: scheme to default CSP policy

Fix sidebar interaction

* resets afterwards
* adds output about the previous log level

Fixes https://github.com/owncloud/core/issues/19438

First integration tests for provisioning api

Use jsqueeze

Allow ajax requests on public webdav interface

Consider both hash params and query when parsing URL

remove warning when trying to get a lock while in transaction

Show loading spinner for first fetch of shares

Show conflict dialog before upload when possible

Hide sidebar tab headers conditionally

Whitelist "data:" in legacy CSP headers

Session closed exception wording

and a small comment typo

Fixes #19425

Fix checkbox in trashbin

Still show share link when recipient but no share permission

When uploading files, first check if the files exist in the current file
list. For the ones that do, show a conflict dialog.
For the rest, upload directly.

If the upload operation detects a conflict on the server side, it will
also continue populating the conflict dialog.

From now on, server side conflict can only occur if someone concurrently
uploaded a file into the same folder but the current user hasn't
refreshed the list yet.

This makes it possible for the recipient to still trigger the sidebar
and share tab to see information about the share.

In the case where the file is not shared and no permissions exists, no
action icon will be displayed.

Whenever the sidebar first loads shares, show a spinner instead of an
empty content