[MERGER][ADD] mass_mailing{crm/sale}: better showcase UTM integration in mass mailing

Specifications

If CRM is installed
 * add 2 stat buttons to the mass mailing form;
 * XX Leads -> redirects to lead list view (should include both types: leads
   & opportunities), only visible if Leads are activated in CRM settings;
 * YY Opportunities -> redirects to opportunities list view (only
   opportunities);
 * those stats buttons are linked to UTM trackers used in the mass mailing
   itself: campaign, source and medium. Those can be configured notably using
   the website_link module;
 * display the stat buttons even if no data;
 * update demo data;

If sales installed
 * add 2 stat buttons to the mass mailing form;
 * XX Quotations -> redirects to quotation list view;
 * YY Invoiced -> redirects to invoice list view. Use the account invoice
   report to generate the invoiced amount;
 * those stats buttons are linked to UTM trackers used in the mass mailing
   itself: campaign, source and medium. Those can be configured notably using
   the website_link module;
 * display the stat buttons even if no data;
 * update demo data;

See sub commits for more details. This merge is linked to task ID 1872198 and
closes PR #26188.

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