Description templates are a variation of file templates, however
description templates were only visible at the project level in which
those were defined.

This implements the ability to inherit description templates from
projects that define description templates and are set as template
repository at group level.

This will allow to display both inherited description templates
from parent group(s) and instance down to project's own own
description templates

Edit issue is using a different FE(vue app) to be redered vs new issue
form. Update templates controller to return the right templates and in
corresponding format, i.e. hash instead of array.

Fix the edge case when templtes in different groups have the same name,
so that it would be correctly resolved to the correct template.