linkerd/linkerd2 edge-20.11.5

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edge-20.11.5

This edge release improves the proxy's support for high-traffic workloads. It also
contains the first steps towards decoupling non-core Linkerd components, the
first iteration being a new linkerd jaeger sub-command for installing tracing.
Please note this is still a work in progress.

• Addressed some issues reported around clients seeing max-concurrency errors by
  increasing the default in-flight request limit to 100K pending requests
• Have the proxy appropriately set content-type when synthesizing gRPC error
  responses
• Bumped the proxy-init image to v1.3.8 which is based off of
  buster-20201117-slim to reduce potential security vulnerabilities
• No longer panic in rare cases when linkerd-config doesn't have an entry for
  Global configs (thanks @hodbn!)
• Work in progress: the /jaeger directory now contains the charts and commands
  for installing the tracing component.