Email notification UI and links inconsistency

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There is an inconsistency in our notification emails UI, particularly in how we display information (layouts, headers) and how we link to the related content.

Because of this inconsistency, often I find it difficult to proceed to GitLab to follow-up on the notification.

There are 3 layouts for the notifications:

plain block of text (see "MR merged" screenshot below)
with layout (see "MR approved" or "Pipeline failed" screenshot below)
subheaders, followed by comment/issue body (see "Issue was created" or "MR was reviewed" screenshot below)

In subheaders we're inconsistent in what and how we link: subject and actors have different order, differently linked or not linked at all.

Related to the issue of linking events, but not notifications: there's an activity thread on the user's profile page, which also has (imo) unobvious way of linking events (see "Profile activity" screenshot below)

Here are some screenshots