Add tag's release note content to notification body

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Description

Integrations are not consistent. For example, if a user integrates Slack Notifications and turn on Issues for it, after an issue is opened in the project, a message is sent to the Slack channel configured and the message contains:

• the issue name and number in bold and
• the description of the issue below it

However, if turning on Tags for the same Slack Notification integration, only the following is sent to the channel:

UserX pushed new tag v0.1.0 to group/project

Both v0.1.0 and group/project in the message above are hyperlinks.

We're currently trying to use tags and leverage the content of release notes to broadcast new releases to our slack teams, but the current implementation makes it unfriendly for two reasons:

1. The message doesn't tell you what are the changes or releases associated with the tag (like Issues's description - screenshot above - does)
2. The hyperlink in v0.1.0 sends the user to http://gitlab.acme.com/group/project/commits/v0.1.0

Proposal

1. The Slack message could contain the release notes' content (when the release note content exists) - in a Slack attachment fashion
2. The hyperlink could point to http://gitlab.acme.com/group/project/tags/v0.3.0 instead of ``http://gitlab.acme.com/group/project/commits/v0.1.0`

This is also true for Merge Requests, not only Tags.

Documentation blurb

While using release notes with tags and having notification-related integrations (e.g. Slack), the notification will contain the release note content