Fix #8160: Warn when --state == --target

[aranke]

resolves #8160

A/C from ticket:

• Raise a warning whenever --state path == --target-path
• Update logic of create_or_replace_clone as described

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

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.01% ⚠️

Comparison is base (3cc7044) 86.56% compared to head (630927c) 86.55%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8638      +/-   ##
==========================================
- Coverage   86.56%   86.55%   -0.01%     
==========================================
  Files         175      175              
  Lines       25596    25610      +14     
==========================================
+ Hits        22157    22168      +11     
- Misses       3439     3442       +3     

Flag	Coverage Δ
integration	83.35% <100.00%> (-0.01%)	⬇️
unit	65.12% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
core/dbt/events/types_pb2.py	1.44% <ø> (+0.10%)	⬆️
core/dbt/contracts/state.py	80.85% <100.00%> (+1.78%)	⬆️
core/dbt/events/types.py	98.64% <100.00%> (+<0.01%)	⬆️

... and 1 file with indirect coverage changes

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