Allow fixing time tracking notes.
### Description
Due to the `/spend` command being increasingly rich, it's easy to do mistakes, like a typo or forgetting to set the date.
### Proposal
Allow for time tracking notes to be edited, adjusting tallies accordingly.
### Links / references
- may be dependent on gitlab-ce#42468 -> gitlab-ce#27824
- gitlab-ce#42551 could be a workaround
issue