ability to attach files whenever uploading results, in the Test Execution issue

[bitcoder]

Provide the ability to attach files whenever uploading results to Xray in Jira, in the Test Execution issue.
A given file can be identified or a regex (regex eventually may be limited to current working directory and subdirs).

Note: this will probably require new settings for Jira API credentials, namely on cloud.

Refs:

• https://confluence.atlassian.com/jirakb/how-to-add-an-attachment-to-a-jira-issue-using-rest-api-699957734.html
• https://developer.atlassian.com/cloud/jira/platform/basic-auth-for-rest-apis/