Remove temp file on failure in update required

[Dashboy1998]

Context

• Currently when the server check for updates it create a temporary file however the file is not deleted if there is an issue retrieving the manifest id.

Choices

• Removing file on failure

Test instructions

1. Create server
2. bash into the server and change the URL on line 63 in helper_install.sh to an invalid one
3. list files in ls /tmp
4. Run update
5. Verify there is no tmp file in ls /tmp

Checklist before requesting a review

• I have performed a self-review of my code
• I've added documentation about this change to the README.
• I've not introduced breaking changes.