Fix #8509: Support doc blocks in nested semantic model YAML

[aranke]

resolves #8509

Problem

Solution

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]

Thank you for your pull request! We could not find a changelog entry for this change. For details on how to document a change, see the contributing guide.

[codecov]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (aa86fdf) 86.61% compared to head (eb253b4) 85.30%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8709      +/-   ##
==========================================
- Coverage   86.61%   85.30%   -1.31%     
==========================================
  Files         176      176              
  Lines       25678    25695      +17     
==========================================
- Hits        22240    21919     -321     
- Misses       3438     3776     +338     

Flag	Coverage Δ
integration	81.66% <70.58%> (-1.70%)	⬇️
unit	65.12% <11.76%> (-0.04%)	⬇️

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

Files	Coverage Δ
core/dbt/parser/schema_renderer.py	95.00% <ø> (ø)
core/dbt/parser/manifest.py	87.42% <70.58%> (-4.66%)	⬇️

... and 34 files with indirect coverage changes

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[gshank]

Looks good!

[github-actions]

The backport to 1.6.latest failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-1.6.latest 1.6.latest
# Navigate to the new working tree
cd .worktrees/backport-1.6.latest
# Create a new branch
git switch --create backport-8709-to-1.6.latest
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 d4fe9a8ad4cbef39054266c26ceeea2d2527e330
# Push it to GitHub
git push --set-upstream origin backport-8709-to-1.6.latest
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-1.6.latest

Then, create a pull request where the base branch is 1.6.latest and the compare/head branch is backport-8709-to-1.6.latest.