Add Cookie based authentication to Jira Server Documentation

Problem Definition

Jira Server Security Overview documentation does not include Cookie-based authentication as an option under https://developer.atlassian.com/server/jira/platform/security-overview/

Suggested Solution

Update Jira Server Security Overview to include REST API Cookie-based authentication.

Notes

The equivalent Jira Cloud page includes Cookie-based authentication as an option, but this is not present in the Jira Server docs.

• This is being deprecated in Jira Cloud. This is not deprecated in Jira Server.

We have documented examples for Jira Server, see Jira REST API example cookie-based authentication for details.

• A similar documentation update was tracked under JRASERVER-44654.