make all installed core plugins pass specs using rake test:plugins

now that #8476 is merge, make sure all core plugins pass tests.

After a first pass at running specs on master for core plugins:
```
rake test:install-core
rake test:plugins
```

I had to exclude these plugins which crashed the test process, see below in comments for details. We will need to fix these two to be able to include them in the tests:
- [ ] logstash-output-email
- [ ] logstash-input-tcp

Tasks:
- [ ] First fix the test code which does not correctly close the pipeline/queue upon an exception
- [ ] Produce a complete list of plugins specs failure of all core plugins.