Provide name of expiring token in personal access token expiration mail

What does this MR do?

Provide name of expiring token in personal access token expiration mail.

Alter the email body from:

One or more of your personal access tokens will expire in 7 days or less.

You can create a new one or check them in your personal access tokens settings

to:

One or more of your personal access tokens will expire in 7 days or less:

• my_test_token
• my_critical_process_token
• another_test_token

You can create a new one or check them in your personal access tokens settings

HTML email:

Plaintext email:

Screenshots (strongly suggested)

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• Security reports checked/validated by a reviewer from the AppSec team

Related to #300714 (closed)