fix: remove logging of credentials

[piksel]

This PR will remove most of the unsafe logging when running with --trace. The reason for this change is that it might be used as a vulnerability and there is no good scenario for when they would be useful (since we don't want users including the information in the issues/discussions anyway).

If the user/developer needs that information, the corresponding line can just be uncommented and built locally:

❯ grep -r 'CREDENTIAL:' .
./pkg/registry/auth/auth.go:            // CREDENTIAL: Uncomment to log registry credentials
./pkg/registry/digest/digest.go:        // CREDENTIAL: Uncomment to log the request token
./pkg/registry/trust.go:                // CREDENTIAL: Uncomment to log REPO_PASS environment variable
./pkg/registry/trust.go:        // CREDENTIAL: Uncomment to log docker config password
./pkg/registry/registry.go:     // CREDENTIAL: Uncomment to log docker config auth

The two places where the logging still remains is the notification URL generated by updating legacy notifications to Shoutrrr URLs, and the docker image/container info logged when watchtower does not have enough information to update a container.

[codecov]

Codecov Report

Base: 66.19% // Head: 66.17% // Decreases project coverage by -0.02% ⚠️

Coverage data is based on head (4a09d02) compared to base (c16ac96).
Patch coverage: 28.57% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1534      +/-   ##
==========================================
- Coverage   66.19%   66.17%   -0.02%     
==========================================
  Files          24       24              
  Lines        2313     2312       -1     
==========================================
- Hits         1531     1530       -1     
  Misses        682      682              
  Partials      100      100              

Impacted Files	Coverage Δ
pkg/registry/auth/auth.go	42.95% <0.00%> (-0.31%)	⬇️
pkg/registry/digest/digest.go	41.46% <0.00%> (-1.40%)	⬇️
pkg/registry/registry.go	26.66% <ø> (+1.66%)	⬆️
pkg/registry/trust.go	47.69% <50.00%> (+0.07%)	⬆️

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