Add a label to an issue/PR when it's linked to a feature

[novakzaballa]

Is your feature request related to a problem? Please describe.

It would be a great feature to filter all the Issues/PRs that are linked with Flagsmith based on a label.

Describe the solution you'd like.

Add a label to an issue/PR when it's linked to a feature, and vice versa, remove the label when it's unlinked.

Describe alternatives you've considered

modifying the API to include functionality for adding a label to an issue or PR

Additional context

No response