Use consistent secret scrubbing

[emmyoop]

resolves #9987

Problem

Secrets are not consistently redacted as ***** and sometimes show up as $$$DBT_SECRET_START$$$DBT_ENV_SECRET_MINE$$$DBT_SECRET_END$$$

Solution

Change the log function to redact the secret in the same way as we do elsewhere in logs.

To avoid circular dependencies, I moved SECRET_PLACEHOLDER into constant.py. I also removed SECRET_ENV_PREFIX in favor of the one defined in dbt-common to avoid having to keep them in sync with each other and risk anything out of sync unexpecedly.

Checklist

• I have read the contributing guide and understand what's expected of me
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• This PR has no interface changes (e.g. macros, cli, logs, json artifacts, config files, adapter interface, etc) or this PR has already received feedback and approval from Product or DX
• This PR includes type annotations for new and modified functions

[github-actions]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.14%. Comparing base (27943a5) to head (6bac246).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10006      +/-   ##
==========================================
- Coverage   88.17%   88.14%   -0.03%     
==========================================
  Files         181      181              
  Lines       22614    22631      +17     
==========================================
+ Hits        19939    19949      +10     
- Misses       2675     2682       +7     

Flag	Coverage Δ
integration	85.44% <100.00%> (-0.12%)	⬇️
unit	62.25% <54.54%> (+0.04%)	⬆️

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