feat: gate Core MCP workload isolation

[ash0ts]

Deferred post-v0.4 experiment

This PR is explicitly excluded from v0.4.0 and is not a release gate for wandb/wandb-mcp-server#117.

The independent v0.4 Helm release is #657, which now owns operator-wandb 0.43.10 and contains no GORILLA_MCP_* settings or dependency on Core workload isolation.

If this experiment resumes after v0.4, it must:

• rebase onto the final feat: ship MCP 0.4 with internal API routing #657 branch or current main
• be renumbered to operator-wandb 0.43.11 or the next available chart version
• remain default-off
• wait for Core ownership and review of wandb/core#49143
• pin and validate exact compatible Core and MCP image digests in Dedicated staging

Experimental scope

• add api.mcpWorkloadIsolation.enabled, defaulting to false
• when explicitly enabled, render through the existing API envTpls mechanism:
  • GORILLA_MCP_MYSQL_CONNECTIONS_PER_REQUEST=2
  • GORILLA_MCP_SDK_GRAPHQL_QUERY_SECONDS=1|2|4 for small, medium, and large+ deployments
• preserve explicit api.containers.api.env overrides
• add no Deployments, Services, replicas, databases, node pools, HPAs, or other Kubernetes resources

The current implementation and validation evidence are historical until the branch is rebased. Do not merge, release, enable, or deploy this PR as part of v0.4.

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