Import SECRET_ENV_PREFIX from dbt-common

[emmyoop]

resolves #10018

Problem

SECRET_ENV_PREFIX is defined in dbt-core and dbt-common

Solution

Import SECRET_ENV_PREFIX from dbt-common and remove the definition from dbt-core

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.20%. Comparing base (29429ec) to head (c096195).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10019      +/-   ##
==========================================
+ Coverage   88.13%   88.20%   +0.06%     
==========================================
  Files         181      181              
  Lines       22638    22643       +5     
==========================================
+ Hits        19953    19973      +20     
+ Misses       2685     2670      -15     

Flag	Coverage Δ
integration	85.58% <100.00%> (+0.14%)	⬆️
unit	62.30% <100.00%> (+<0.01%)	⬆️

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