GHA: Fix bad job-names & links in monitoring emails

Due to a bad file-format design, if a cirrus-cron job happened to have a
name w/ spaces, the generated e-mail text would be broken.  For example:

```
Cron build 'VM' Failed: https://cirrus-ci.com/build/Image Maintenance
5630822628196352
```

Fix this by flipping the field-order in an intermediate file, so the
build ID comes first, then the job name.  This makes it much easier for
`read` to process, since all words will be stored into the final
variable (now the job name).

Also change all variables that reference this intermediate file such
that they continue to reflect the expected field order.  Update script
tests and add a new test to confirm expected file processing and output.

Signed-off-by: Chris Evich <[email protected]>