Update docs to note MCP support in JetBrains plugin

Karl Jamoralinrequested to merge
kjamoralin-master-patch-2bc5 into master

What does this MR do and why?

This MR updates the GitLab MCP Clients documentation page to mention MCP support in the JetBrains plugin. Closes gitlab-org/editor-extensions/gitlab-jetbrains-plugin#1268 (closed).

References

gitlab-org/editor-extensions/gitlab-jetbrains-plugin#1268 (closed)

Edited by Karl Jamoralin

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