cli: retry auth handshake deadline exceeded errors in CLI and Terraform

[daniel-weisse]

Context

CLI (and also our Terraform provider) uses gRPC to talk with different services on Constellation.
We have a retry logic for these calls that make sure transient errors don't cause the entire action to fail.
In the past we have observed "authentication handshake failed: context deadline exceeded" during these rpcs.

Since we do not set a deadline for some of our CLI commands (e.g. constellation recover) but we have observed these errors nonetheless, I believe that gRPC/Go TLS uses a custom deadline at some point during the handshake.
This deadline may be exceeded by transient connection errors and should be retried by our code.

Proposed change(s)

• add authentication handshake failed: context deadline exceeded to the list of retriable rpc errors

Related issue

This PR may resolve the following issues, though we should keep them open and observe potential regressions:

• https://github.com/edgelesssys/issues/issues/110
• https://github.com/edgelesssys/issues/issues/424

Checklist

• Run the E2E tests that are relevant to this PR's changes
  • e2e sanity check
• Update docs
• Add labels (e.g., for changelog category)
• Is PR title adequate for changelog?
• Link to Milestone

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[github-actions]

Coverage report

Package	Old	New	Trend
internal/grpc/retry	90.90%	92.30%	↗️

[burgerdev]

lgtm, thanks!