Support overwriting tables and views with materialized views

[damian3031]

resolves #8194
docs dbt-labs/docs.getdbt.com/#

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

Merging #8195 (bcd1faf) into main (ff5cb7b) will decrease coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #8195      +/-   ##
==========================================
- Coverage   86.23%   86.17%   -0.06%     
==========================================
  Files         174      174              
  Lines       25498    25498              
==========================================
- Hits        21988    21973      -15     
- Misses       3510     3525      +15     

see 3 files with indirect coverage changes

[dbeatty10]

From @Fleid here:

Hi @damian3031 - thanks so much for the quick intervention, but we're already planning to enable that in 1.7 ourselves (releasing it early in a beta somewhere in August).

Sadly we can't re-purpose your work, as we are currently refactoring the first internal implementation of MVs that your contribution is based on. We sincerely appreciate your efforts, and hopefully you'll be able to test the new iteration later this summer.