[BUG] BitBucketServer personal projects are not taken into consideration

[danibaeyens]

Describe the bug
In BitbucketServer you can use project repositories, but you can also create your own personal repositories in your account. These follow a slightly different path structure:

https://bitbucker.server/projects/FOO/repos/BAR/pull-requests/1
https://bitbucker.server/projects/~user/repos/BAR/pull-requests/1

In case danger is invoked for a personal project, the resolved API path is wrong

See docs: https://docs.atlassian.com/bitbucket-server/rest/5.16.0/bitbucket-rest.html#personal-repositories

To Reproduce
Steps to reproduce the behaviour:

1. run danger pr https://bitbucker.server/projects/FOO/repos/BAR/pull-requests/1
2. danger will get a 404 unable to fetch a correctly resolved API call

Expected behaviour
In our case, the bitbucket server host structure has a root path, which can be also relevant to the scenario:

• a PR to this URL: https://bitbucket.server/bitbucket/projects/~USER/repos/BAR/pull-requests/3
• is resolved to: https://bitbucket.server/bitbucket/rest/api/1.0/bitbucket/projects/~USER/repos/BAR/pull-requests/1
• where it should be: https://bitbucket.server/bitbucket/rest/api/1.0/projects/~USER/repos/BAR/pull-requests/1

Your Environment

software	version
danger.js	10.6.3
node	14.16.0
npm	7.5.6
Operating System	macOS 10.15.7