[RunConv][Frontend] Notify user when exporting a preparation

As a Data Preparation user,
I want to get a notification when the preparation execution has started / ended successfully / failed
in order to know as soon as possible the execution result in a more visible way.

Why?

Currently, the export history can be opened using an icon button with a status dot (indicating the result of the last export). Usage feedback indicates that it is not visible and explicit enough for the users.

How?

• add notification on full run launching:
  • Type: info
  • Message: Export in progress The XXX preparation is being exported. Go to the export history page for more details.
• add notification on full run successful ending:
  • Type: success
  • Message: Export successful The XXX preparation has been successfully exported. Go to the export history page for more details.
• add notification on full run ending with error:
  • Type: error
  • Message: Export failed The XXX preparation export has failed. Go to the export history page for more details.

Not impacted by feature flipping => available to all

Acceptance criteria

Given a tenant with or without Runtime Convergence activated,
and a preparation opened
When user launches a run / export
Then a notification informs that the run / export is in progress

Given a tenant with or without Runtime Convergence activated,
and a preparation opened with a launched run / export
When the run / export is finished successfully
Then a notification informs that the run / export is successfully completed
Note: in Runtime Convergence mode, as long the feedback from pipeline is not available (TDP-9769), the notification may not be testable

Given a tenant with or without Runtime Convergence activated,
and a preparation opened with a launched run / export
When the run / export is finished with errors
Then a notification informs that the run / export is failed
Note: in Runtime Convergence mode, as long the feedback from pipeline is not available (TDP-9769), the notification may not be testable 

Out of scope:

• Rewording of "Export" into "Run" => will be handled separately.