[IMP] utm: Add kanban examples for UTM campaigns

Inspired by what is done in the task kanban of the project module,
add examples of kanban stage setups for UTM campaigns, and allow users
to load them.

There have also been some minor changes to the campaigns view:

- The helper message when there are no UTM campaigns has been changed
  to a more descriptive message.
- All stages that existed by default (hardcoded in the data XML) have
  been removed except default New one. An user with a fresh database will
  have no stages in their kanban. The old hardcoded stages have been moved
  to the demo data instead, so they will still be added by default if the
  user installs demo data.
- The ghost columns that appear in the kanban when no stages exist have
  been renamed to match the old stages that were hardcoded.
- When the user opens the view to create a column, the 'See examples'
  link will appear below the 'Column title', just like in the project
  addon, and clicking it will open some examples specifically made for UTM
  campaigns. Clicking on the 'Use This For My Kanban' button will load the
  stages of the selected example.
- A min-height property has been given to the example modal view so that
  the view does not change size depending on the number of rows in the
  ghost columns.

Task ID: 2047369
PR #48299

1 files changed, 2 insertions, 12 deletions

diff --git a/addons/utm/data/utm_data.xml b/addons/utm/data/utm_data.xml
index 0b9a5fb62d7..cf7bafd7134 100644
--- a/addons/utm/data/utm_data.xml
+++ b/addons/utm/data/utm_data.xml
@@ -1,22 +1,12 @@
 <?xml version="1.0" encoding="utf-8"?>
 <odoo>
         <!-- UTM Stage -->
+        <!-- This one is kept in data instead of demo to avoid crashing if the user starts creating campaigns
+        before stages have been created, as they are mandatory -->
         <record id="default_utm_stage" model="utm.stage">
             <field name="name">New</field>
             <field name="sequence">10</field>
         </record>
-        <record id="campaign_stage_1" model="utm.stage">
-            <field name="name">Schedule</field>
-            <field name="sequence">10</field>
-        </record>
-        <record id="campaign_stage_2" model="utm.stage">
-            <field name="name">Design</field>
-            <field name="sequence">20</field>
-        </record>
-        <record id="campaign_stage_3" model="utm.stage">
-            <field name="name">Sent</field>
-            <field name="sequence">30</field>
-        </record>
 
         <!-- UTM Source -->
         <record model="utm.source" id="utm_source_search_engine">