On Conversion of a ticket to a bounty remove all tickets from a ticket group

[MahtabBukhari]

Describe your changes

Issue ticket number and link: http://community.sphinx.chat/bounty/3459

Evidence:

https://www.loom.com/share/ae810ec50d564c5888df67b4d62c631c?sid=6a84b24e-b203-4e65-9423-54ad841034b8

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist before requesting a review

• I have performed a self-review of my code
• I have tested on Chrome and Firefox
• I have tested on a mobile device
• I have provided a screenshot or recording of changes in my PR if there were updates to the frontend

[MahtabBukhari]

@humansinstitute Could you please review the PR?

irrelative test fail