* Chore: Feature lock email settings in UI
The email settings under account settings needed to be
feature locked in a way different from teh current way for it
to be enabled for accounts in a self hosted scenario.
Some refactorings were also done along with this change.
1. There was a feature flag defined in code in account model called
domain_emails_enabled was used to check if the inbound emails was
enabled for the account. But there was already a feature flag called
"inbound_emails" defined in features.yml. So changed to use this to
check if inbound emails are enabled for an account.
2. Renamed and re-purposed existing `domain_emails_enabled` to
`custom_email_domain_enabled` to use for feature toggling the UI
for email settings.
3. To enable & disable multiple features using the featurable concern
we were passing an array of values. Changed this to accept a comma
separated set of values.
* Chore: Feature lock email settings in UI
Fixed the specs for accounts controller & removed
unneccessary code from Account seetings component in UI
* Chore: Convert newlines to <br>s
Removed the layout used while sending replies in
conversation continuity.
Converted the newlines in the messages to <br/> tags
for the correct HTML rendering.
* Chore: Bug fix in reply email domain
Renamed the function custom_email_domain_enabled to
inbound_email_enabled.
Fixed bug on setting reply emails's domain.
Right now as part of conversation continuity, we are using the
ConversationReplyMailer which sends a summary of messages including
the incoming messages when an agent replies. Ideally, we want
to send only the reply of that agent and not a summary when
Conversation continuity is enabled. Added the functionality
to send the reply email without summary. Added required unit
tests to cover the changes.
ref: #1048
