Warning added for merge train pipeline appears for merged result pipelines

Summary

In #285529 (closed) we added a warning for merge train pipelines in the mini-graph stating retry isn't allowed.

In some instances its showing up for merged result pipelines, and goes away after a while.

Steps to reproduce

Create a new merge request that in a project that has merged result pipeline configured and merge trains enabled.

When the merged result pipeline starts, click on mini-graph, the message appears.

Example Project

gitlab-com/content-sites/handbook!1977 (merged)

What is the current bug behavior?

The message that's put in the dropdown exclusively for merge train pipelines, is shown for merged result pipelines even though retry is allowed for those.

What is the expected correct behavior?

The message should not appear if the graph isn't for merge train pipelines.

Relevant logs and/or screenshots

Output of checks

Results of GitLab environment info

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Results of GitLab application Check

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(For installations with omnibus-gitlab package run and paste the output of: `sudo gitlab-rake gitlab:check SANITIZE=true`)

(For installations from source run and paste the output of: `sudo -u git -H bundle exec rake gitlab:check RAILS_ENV=production SANITIZE=true`)

(we will only investigate if the tests are passing)