Trying to fix #652 , Bitbucket Cloud GDPR Changes

[nutellinoit]

As @Phylu stated:

https://developer.atlassian.com/cloud/bitbucket/bitbucket-api-changes-gdpr/

I changed bitbucket cloud merge logic using account_id instead of username.
Tested against real repository using self approval (with correct apply failed) and other users approval.

I can't try on bitbucket server...

[codecov]

Codecov Report

Merging #654 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master    #654      +/-   ##
=========================================
+ Coverage   72.19%   72.2%   +<.01%     
=========================================
  Files          61      61              
  Lines        4643    4644       +1     
=========================================
+ Hits         3352    3353       +1     
  Misses       1045    1045              
  Partials      246     246

Impacted Files	Coverage Δ
server/events/models/models.go	74.6% <ø> (ø)	⬆️
server/events/vcs/bitbucketcloud/client.go	39.51% <100%> (ø)	⬆️
server/events/event_parser.go	88.01% <100%> (+0.03%)	⬆️

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[lkysow]

Hi Samuele,
I fixed this with #657 where I just used the response from the pull request API call rather than carrying the UUID field throughout the codebase.

Thanks for the PR and I apologize for not working through a review with you and just making the changes myself. I thought that since this is an issue preventing users from using Atlantis that speed was of the essence.