feat: Add functionality to disable posts in abandoned negotiations

[jungwire]

Negotiator pull request:

Description:

Adds functionality to disable posts in abandoned negotiations

Checklist:

Make sure you tick all the boxes bellow if they are true or do not apply:

• [x] I have performed a self review of my code
• [x] My code follows Google Java Code style
• [x] I have made my code as simple as possible
• [x] I have added unit tests and the code coverage has not decreased
• [ ] I have updated the documentation in all relevant places

[codecov[bot]]

Codecov Report

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

Project coverage is 75.98%. Comparing base (c32de8e) to head (a3f3fbc).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #203 +/- ## ============================================ + Coverage 75.88% 75.98% +0.09% - Complexity 908 913 +5 ============================================ Files 125 126 +1 Lines 2700 2711 +11 Branches 155 155 ============================================ + Hits 2049 2060 +11 Misses 541 541 Partials 110 110 ``` | [Flag](https://app.codecov.io/gh/BBMRI-ERIC/negotiator/pull/203/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BBMRI-ERIC) | Coverage Δ | | |---|---|---| | [unit](https://app.codecov.io/gh/BBMRI-ERIC/negotiator/pull/203/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BBMRI-ERIC) | `75.98% <100.00%> (+0.09%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BBMRI-ERIC#carryforward-flags-in-the-pull-request-comment) to find out more.

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