[FIX] packages: include missing data for l10n_mx

When building the enterprise packages, some data files were ignored.
With this commit, the demo data and missing xslt files are packaged.

This fixes #21045 and fixes #21015

MANIFEST.in

@@ -37,5 +37,7 @@ recursive-include odoo *.xsd
 recursive-include odoo *.xsl
 recursive-include odoo *.xml
 recursive-include odoo *.yml
+recursive-include odoo/addons/l10n_mx_edi *.xslt *.key *.cer *.txt
+recursive-include odoo/addons/l10n_mx_reports *.xslt
 recursive-exclude * *.py[co]
 recursive-exclude * *.hg*