Minor cleanup of client/main.go

[nshalman]

Description

shell.nix: include docker-compose for Makefile compatibility
client: purge unused NewFullClientFromGlobal function
client: factor out grpcCredentialFromCertEndpoint from two locations into function

Why is this needed

This removes unused code, and factors out duplicate code into a single function. The codebase is better than it was before.

How Has This Been Tested?

make images
make run-stack
cat focal.yaml | docker exec -i tink_tink-cli_1 tink template create
docker exec -i tink_tink-cli_1 tink template get
docker exec -i tink_tink-cli_1 tink template delete <uuid>

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 #570 (3ceec2a) into main (b72ab0b) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #570   +/-   ##
=======================================
  Coverage   34.76%   34.76%           
=======================================
  Files          44       44           
  Lines        3348     3348           
=======================================
  Hits         1164     1164           
  Misses       2085     2085           
  Partials       99       99           

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