Add name to the subject of certificate issuance email

[harigopal]

@pupilfirst/developers Similar to #1535, this adds the name to the subject of the certificate issuance sent to students. The main advantage here is that students replying to the issuance email will do so with a custom Re: SUBJECT, forcing the emails to not get clubbed in the school's mailbox.

Merge Checklist

• Add specs that demonstrate bug / test a new feature.
• Check if route, query, or mutation authorization looks correct.
• Ensure that UI text is kept in I18n files.
• Update developer and product docs, where applicable.
• Prep screenshot or demo video for changelog entry, and attach it to issue.
• Check if new tables or columns that have been added need to be handled in the following services:
• Check if changes in packaged components have been published to npm.
• Add development seeds for new tables.
• If the updates involve Graph mutations ensure that the files are migrated to the new approach without a mutator.
• If the updates involve adding a new table ensure that rate limiting is added and documented in the docs/developers/rate_limiting.md file.

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