Jira : add account_id to the parameters of add_user_to_group for Jira Cloud

[YugoHino]

This PR is to add account_id to the parameters of add_user_to_group for Jira Cloud. Username of the parameters is no longer available for Jira Cloud. When the site url contains Jira Cloud one, account_id is used for the parameter. This PR is add version of this PR https://github.com/atlassian-api/atlassian-python-api/pull/1018 . For DC/Server users, there is nothing to change.

[codecov-commenter]

Codecov Report

Merging #1028 (7f1530c) into master (c0b7627) will decrease coverage by 0.01%. The diff coverage is 20.00%.

@@            Coverage Diff             @@
##           master    #1028      +/-   ##
==========================================
- Coverage   35.98%   35.97%   -0.02%     
==========================================
  Files          35       35              
  Lines        6780     6783       +3     
  Branches     1057     1058       +1     
==========================================
  Hits         2440     2440              
- Misses       4234     4237       +3     
  Partials      106      106              

Impacted Files	Coverage Δ
atlassian/jira.py	19.09% <20.00%> (-0.04%)	:arrow_down:

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