Browser notifications don't correctly escape HTML
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### Summary
When I have an MR with `<>` in it, like "Something with std::unique_ptr\<int\>", it is escaped incorrectly in the Windows/Chrome browser notification popup when it changes status, so I see it as roughly "Something with std::unique_ptr & lt ; int & gt ;" in the popup window.
### Steps to reproduce
Make an MR with `<>` in the title on Windows with Chrome, enable notifications, and kick off CI. Note that the popup shows raw HTML for the `<>`.
### What is the current _bug_ behavior?
The popup shows "Something with std::unique_ptr& lt ; int & gt ;" (except without the extra spaces -- I had to add them so this WYSIWYG Markdown entry window doesn't turn them into \<\>s.
### What is the expected _correct_ behavior?
The popup shows "Something with std::unique_ptr\<int\>".
### Relevant logs and/or screenshots
I'll attach one if I catch it. The popup only stays for a moment.
### Output of checks
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#### Results of GitLab environment info
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<summary>Expand for output related to GitLab environment info</summary>
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(For installations with omnibus-gitlab package run and paste the output of: \\\\\\\\\\\\\\\`sudo gitlab-rake gitlab:env:info\\\\\\\\\\\\\\\`) (For installations from source run and paste the output of: \\\\\\\\\\\\\\\`sudo -u git -H bundle exec rake gitlab:env:info RAILS_ENV=production\\\\\\\\\\\\\\\`)
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#### Results of GitLab application Check
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<details>
<summary>Expand for output related to the GitLab application check</summary>
<pre>
(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)
</pre>
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### Possible fixes
Check with Little [Bobby Tables](https://xkcd.com/327/). Fix the escaping.
### Patch release information for backports
If the bug fix needs to be backported in a [patch release](https://handbook.gitlab.com/handbook/engineering/releases/patch-releases) to a version under [the maintenance policy](https://docs.gitlab.com/policy/maintenance/), please follow the steps on the [patch release runbook for GitLab engineers](https://gitlab.com/gitlab-org/release/docs/-/blob/master/general/patch/engineers.md).
Refer to the [internal "Release Information" dashboard](https://dashboards.gitlab.net/d/delivery-release_info/delivery3a-release-information?orgId=1) for information about the next patch release, including the targeted versions, expected release date, and current status.
#### High-severity bug remediation
To remediate high-severity issues requiring an [internal release](https://handbook.gitlab.com/handbook/engineering/releases/internal-releases/) for single-tenant SaaS instances, refer to the [internal release process for engineers](https://gitlab.com/gitlab-org/release/docs/-/blob/master/general/internal-releases/engineers.md?ref_type=heads).
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