Use db.Database interface in grpc server

[micahhausler]

Signed-off-by: Micah Hausler [email protected]

Description

Use the interface type instead of the concrete type

Why is this needed

Prep work for Tink API using Kubernetes Resource Model

Fixes:
N/A

How Has This Been Tested?

Ran tests/verify locally

How are existing users impacted? What migration steps/scripts do we need?

N/A

Checklist:

I have:

• updated the documentation and/or roadmap (if required)
• added unit or e2e tests
• provided instructions on how to upgrade

[codecov]

Codecov Report

Merging #569 (a417791) into main (6e66633) will not change coverage.
The diff coverage is n/a.

❗ Current head a417791 differs from pull request most recent head 9ce724f. Consider uploading reports for the commit 9ce724f to get more accurate results

@@           Coverage Diff           @@
##             main     #569   +/-   ##
=======================================
  Coverage   34.76%   34.76%           
=======================================
  Files          44       44           
  Lines        3348     3348           
=======================================
  Hits         1164     1164           
  Misses       2085     2085           
  Partials       99       99           

Impacted Files	Coverage Δ
grpc-server/grpc_server.go	35.21% <ø> (ø)

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