Add additionalMCPServers for external MCP servers

[sdatko]

The mcp_servers section of the generated lightspeed-stack config was hardcoded to only the two rhos-mcps entries (rhoso-ocp-tools, rhoso-osp-tools), with no way to plug in other in-cluster MCP servers such as korrel8r or a Prometheus MCP.

This commit adds additionalMCPServers option, containing a list of {name, url, authorizationHeaders} entries appended to mcp_servers independently of the rhoso_mcps feature flag, so it works even when the rhos-mcps sidecar itself is disabled.

The authorizationHeaders is a free-form header-name -> mode map mirroring lightspeed-stack's own authorization_headers schema, since different MCP servers expect different header conventions (e.g. korrel8r's plain Authorization: Bearer vs. rhos-mcps's OCP_TOKEN/OS_TOKEN).

This is an experimental feature: lives under the unstable dev.* block just like the existing rhosMCP options, no CRD schema change needed since Dev is a RawExtension.

Assisted by: Claude Sonnet 5

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This pull-request has been approved by: sdatko
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[centosinfra-prod-github-app]

Build succeeded (check pipeline).
https://gateway-cloud-softwarefactory.apps.ocp.cloud.ci.centos.org/zuul/t/rdoproject.org/buildset/ab5d51ba162b41b6a6bfcb2493c286c9

✔️ openstack-k8s-operators-content-provider SUCCESS in 1h 26m 06s
❌ lightspeed-operator-deployment-crc FAILURE in 1h 11m 18s (non-voting)