chore(general): use non-formatting log variants when there is no formatting

[julio-lopez]

Use non-formatting logging functions for message without formatting.
For example, log.Info("message") instead of log.Infof("message")

Configure linter for printf-like functions

[codecov]

Codecov Report

Attention: Patch coverage is 66.90141% with 47 lines in your changes missing coverage. Please review.

Project coverage is 77.24%. Comparing base (cb455c6) to head (3815fe6).
Report is 169 commits behind head on master.

Files	Patch %	Lines
cli/command_mount.go	0.00%	5 Missing ⚠️
cli/command_repository_set_client.go	42.85%	4 Missing ⚠️
repo/maintenance/maintenance_run.go	76.47%	4 Missing ⚠️
cli/update_check.go	0.00%	3 Missing ⚠️
internal/server/source_manager.go	0.00%	3 Missing ⚠️
cli/command_snapshot_list.go	0.00%	2 Missing ⚠️
...nternal/passwordpersist/passwordpersist_keyring.go	0.00%	2 Missing ⚠️
repo/content/content_manager.go	66.66%	2 Missing ⚠️
cli/auto_upgrade.go	0.00%	1 Missing ⚠️
cli/command_blob_gc.go	0.00%	1 Missing ⚠️
... and 20 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3931      +/-   ##
==========================================
+ Coverage   75.86%   77.24%   +1.37%     
==========================================
  Files         470      481      +11     
  Lines       37301    28803    -8498     
==========================================
- Hits        28299    22249    -6050     
+ Misses       7071     4657    -2414     
+ Partials     1931     1897      -34     

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