Promote squash commits

Related to https://gitlab.com/gitlab-org/gitlab-ee/issues/2624

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Design

Promote trial or license activation for regular EE on-prem sites.

Admin

• Having Start GitLab Enterprise Edition trial button.
• Having x on the top-right corner.
• Read more
• Link to the document, so users can know more about the feature.
• Link: https://docs.gitlab.com/ee/user/project/merge_requests/squash_and_merge.html
• Copy:

Improve Merge Requests with squash commit and GitLab Enterprise Edition.

Squashing lets you tidy up the commit history of a branch when accepting a merge request. 
It applies all of the changes in the merge request as a single commit, 
and then merges that commit using the merge method set for the project. [Read more]

Non-admin

• Copy:

Improve Merge Requests with squash commit and GitLab Enterprise Edition.

Squashing lets you tidy up the commit history of a branch when accepting a merge request. 
It applies all of the changes in the merge request as a single commit, 
and then merges that commit using the merge method set for the project. [Read more]

Contact your Administrator to upgrade your license.

Admin	Non-admin

For GitLab.com the feature promotion needs to go to purchase a GitLab.com plan

Admin

• Having Upgrade your plan button.
• Copy:

Upgrade your plan to activate Squach commit.

Squashing lets you tidy up the commit history of a branch when accepting a merge request. 
It applies all of the changes in the merge request as a single commit, 
and then merges that commit using the merge method set for the project. [Read more]

Non-admin

• Copy:

Upgrade your plan to activate Squach commit.

Squashing lets you tidy up the commit history of a branch when accepting a merge request. 
It applies all of the changes in the merge request as a single commit, 
and then merges that commit using the merge method set for the project. [Read more]

Contact your Administrator to upgrade your plan.

Admin	Non-admin

mentioned in issue #2624 (closed)

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@hazelyang why does this say "Trial Expired" in the GitLab.com section?

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why does this say "Trial Expired" in the GitLab.com section?

@mydigitalself That's my mistake... I updated the copy and the design in the description.

@hazelyang do you think it's a better idea to keep the heading of the promotion the same for admins and non admin.

For admins, we show the button to Upgrade License or Plan and for non admins, instead of the button, we say "Contact your administrator to upgrade your licence/plan"? The same applies for all other promotion issues.

So it will look like:

Improve Merge Requests with squash commit

Squashing lets you tidy up the commit history of a branch when accepting a merge request. It applies all of the changes in the merge request as a single commit and then merges that commit using the merge method set for the project.

If admin & if self-hosted Start Trial

If admin & if GitLab.com Upgrade your plan

If !admin & if self-hosted "Contact your administrator to upgrade your license."

If !admin & if GitLab.com "Contact your administrator to upgrade your plan."

We could also say Start GitLab Enterprise Edition Trial and "Contact your administrator to upgrade to GitLab Enterprise Edition"

Do you think the first one is too long for a button can you try it in a visual and see? Can you also try it in some smaller ones, e.g. issue weights screenshot and see what it looks like?

do you think it's a better idea to keep the heading of the promotion the same for admins and non admin.

Agree. I will modify them.

We could also say Start GitLab Enterprise Edition Trial and "Contact your administrator to upgrade to GitLab Enterprise Edition"

@mydigitalself It seems Start GitLab Enterprise Edition Trial is too long for issue weight. I would lean toward Start trial or Start Enterprise Edition. What do you think?

General banner	Issue weight dropdown

mentioned in issue #2966 (closed)

@hazelyang you could make the Weight popout a little wider or have "Start GitLab EE Trial" where it doesn't fit?

@mydigitalself I think having "Start GitLab EE Trial" where it doesn't fit would be better. I'll modify them. Thanks for these ideas.

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added UX ready and removed UX labels

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Updated the button texts and copies in the description.