RFQ for 12.0 migration

[rvalyi]

while reviewing project_api in v10.0 I could spot these evolutions when migrating to 12.0:

class ProjectProject(models.Model):
  tag_ids = fields.Many2many("project.tags", string="Tags")
  
# use https://github.com/OCA/project/blob/12.0/project_tag in v12

  functional_area = fields.Selection(...
# use https://github.com/OCA/project/tree/12.0/project_category in v12

[github-actions]

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