Send notification when there is a new private note

Is your feature request related to a problem? Please describe.

This PR introduced private notes on admin proposals. Admins can add notes on the proposal for the other admins and valuators but they don't really know that there is a note until they check its dedicated section. Only a counter in the proposal admin index allows admins to know if a proposal received 1 or several private notes, but as an admin, from the index there is no indicator of how recent they are.

Describe the solution you'd like

We'd like to send a notification to the concerned users (admins and valuators) when a private note is left on proposal.

I suggest to add the following notifications

1.Email notification :

• Subject : There is a new private note from %{author} on %{proposal_title}.
• Intro : Hello %{name}
• Body : %{admin_name} has added this private note to <a href="%{proposal_link}">%{proposal_title}</a> :

%{private_note_content}

• <a href="%{answer_link_admin_panel}"> Add your private answer </a>
• Outro: You received this email because you are %{role} on %{space_title}

2.Platform notification :

• Notification type : Private note
• Subject : Proposal private note
• Body : %{admin_name} has added a private note to the following proposal : <a href="%{answer_link_admin_panel}">%{proposal_title}</a> .

Additional context

Does this issue could impact on users private data?

No.

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Open Source Politics