XWIKI-18910: Errors appear in the wiki console after selecting the "Forgot your username or password option", on a Multilingual wiki (#1689)

  * Ensure to display the language menu only if $doc is defined in the
    current context.

(cherry picked from commit 44c8fdfd)

- Improve the icons fetch mocking
- Introduce flush-promises to make it easier to wait for asynchronous tasks to be finished before the assertions

(cherry picked from commit 6e1f0d4f)

(cherry picked from commit b1b740e5)

(cherry picked from commit 3b9a741d)

(cherry picked from commit 21f97d25)

* workaround a strange error in the integration tests

(cherry picked from commit 1ccc8429)

* forgot one case of invalidation

(cherry picked from commit f3b0b452)

XWIKI-18976: Impossible to migrate deleted fs attachments from <9.10 when moving the permanent dir but the old one exist too

(cherry picked from commit f7117765)

(cherry picked from commit b1b7552a)

This commits contains a set of small improvements aimed at speeding-up the rendering of tables with a large amount of properties to display.
This involves:
- not displaying components when possible by moving v-if statements from the callee to the caller
- prevent re-rendering of frequently instantiated components by using v-show
In addition, a tippy feature that we do not currently use is turned off.

- Add a missing mock file
- Replace this.config.hasOwnProperty(property) by Object.prototype.hasOwnProperty.call(this.config, property)

(cherry picked from commit 3b62a900)

- Freeze the entries collection to prevent Vue to add reactive listener to all the sub-attributes of the entries Array
- Move updateEntries call to the beginning of the Logic initialization to display the datas to the user early
- Improve webpack's bundling by importing explicitly the default Live Data displayers and filters

* use simpler DocumentReference constructor

* make test more robust by working on the document
  actually stored in the (spy) xwiki instance

* improve and simplify the unit test

- store group property as LargeStringValue, not StringValue
- also use ListClass.getStringFromList to join the groups
  (which is more of a theoretical issue as the rights UI
  creates a separate RightsClass object for every group)

(cherry picked from commit 3af415cd)

- Introduce a message displayed to the user when the entries update fails
- Introduce a console log with the error details when the entries update fails

- Provide a generic exception mapper for all checked exceptions
- Log the mapped exception in the logs and return a HTTP 500 response

(cherry picked from commit 7e055c04)

XWIKI-18942: Rollback of a document version containing a different attachment with the same name and version does not work

(cherry picked from commit 570f5556)

(cherry picked from commit 42c01e35)

- Decrease the message box height on Live Data
- Add rounded corners on Livetable messages and adapt padding to have uniform styles

(cherry picked from commit 7931467f)

Handle the case where the XWiki variable is not 'undefined' but not available in the execution scope.

The dependencies where incorrectly placed in the docker-test module.

- Replace the equality condition with a like for the empty match, otherwise Oracle raises an error
- Add an alternative is null condition because Oracle stores the empty string as NULL

(cherry picked from commit 5251ae7d)

* Prototype.js needs to be loaded before the in-line script that fixes the incompatibility with Bootstrap.

(cherry picked from commit e2a484d8)

XWIKI-18895: Inject the required skin extensions from the X-XWIKI-HTML-HEAD custom response header into the page HTML head automatically

(cherry picked from commit 73dc2883)

XWIKI-18922: Migration of table xwikirecyclebin fail from a database created with a very old XWiki version

(cherry picked from commit 81d3a8e4)