Slugify termation category

[PrenSJ2]

Close #255

Description

create sanitise_string to modify a sting into to the expected output of django's slugify

We use this for the terminaion_category

Testing

• setup with termination_category customfield on tc2
• set the termination for a cligency which has a company in hermes and org on pd
• then update the org, bdr_person_id or something to trigger the webhook back to tc2
• see that no api error occured

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 93.59%. Comparing base (88f8a0d) to head (34db386).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #256 +/- ## ========================================== + Coverage 93.56% 93.59% +0.02% ========================================== Files 29 29 Lines 1756 1763 +7 Branches 242 243 +1 ========================================== + Hits 1643 1650 +7 Misses 71 71 Partials 42 42 ```

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