Update credential transfer email copy and enable transfer on project credentials table

[christad92]

This issues features a couple of improvements to the credentials transfer experience:

• Show that transfer credential button on the project credentials table
  For credential owners who have access to multiple projects (e.g. Aleksa/Rita) it is easier for them to find credentials through the project credentials page compared to their /credentials page.

In the future, it would be great to have a bulk action for transferring credentials.

• Update email copies

Confirmation Email
Subject: Transfer #credential_name to new_owner_name

Hello #name 

You are about to transfer {#credential_name} to new_owner (email). Please ignore this email if you have not requested to transfer this credential. 

To confirm this activity, click the link below: 

(link)

Please note: 
1. Transferring your credentials is irreversible and can impact the security of your projects. 
2. This link is only valid for 2 days. 

OpenFn

Email to recipient
Subject: A credential has been transferred to you. 

Ayodele has transferred the credential “#credential_name” to you. As a credential owner, you can edit the credential details and share the credential with other projects in your OpenFn account.

See your credential list here:  (link)  

OpenFn