Add: Remote link: Application

[IncandescentChrysalis]

Fixes #1448, Replaces #1429

Adding a link to an application connected with a Jira instance through the /rest/api/2/issue/{issueIdOrKey}/remotelink Jira API route, an application section might be provided.
This might for instance be used to add Confluence links to a connected Confluence instance.
Cf. Atlassian knowledge base about the different kind of links.

This PR add an application parameter to the create_or_update_issue_remote_links function.

[IncandescentChrysalis]

Also added a test for the base create_or_update_issue_remote_links, since there was none…

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 34.43%. Comparing base (a7e56b5) to head (f7e1a3e).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1455      +/-   ##
==========================================
+ Coverage   34.34%   34.43%   +0.08%     
==========================================
  Files          46       46              
  Lines        8623     8625       +2     
  Branches     1609     1610       +1     
==========================================
+ Hits         2962     2970       +8     
+ Misses       5536     5528       -8     
- Partials      125      127       +2     

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