Update Jira Integration due to Deprecated features on REST Api

[ljay79]

See more here:
https://developer.atlassian.com/cloud/jira/platform/deprecation-notice-user-privacy-api-migration-guide/

• "username" is not available anymore
• other user private data is removed (email?)
  -- The User object will change: Identifying personal data, such as username and userKey , will be removed and other personal data, such as email, will be displayed according to user settings.

User Authentication

• Upgrade to REST API v3

Jira Server

https://developer.atlassian.com/server/jira/platform/rest-apis/
https://docs.atlassian.com/software/jira/docs/api/REST/8.1.0/

• Authentication. The following authentication methods are supported for the Jira REST APIs:
  • OAuth 1.0a
  • Basic authentication

Jira Cloud

https://developer.atlassian.com/cloud/jira/platform/rest/v3/
https://developer.atlassian.com/cloud/jira/platform/security-for-other-integrations/

• OAuth 2.0 authorization code grants (3LO): This is the recommended method.
• Basic authentication (Deprecated)
• API Token (https://confluence.atlassian.com/cloud/api-tokens-938839638.html)

Further notices to review:
https://developer.atlassian.com/cloud/jira/platform/

Relates to #24