Fix #10098 by undoing conditional agate import in one place

[jtcohen6]

resolves #10098

Problem

Conditional import of agate for TYPE_CHECKING is leading to mashumaro.exceptions.UnresolvedTypeReferenceError during RunResult.to_dict() serialization

Solution

Undo the conditional import for now, with a slight performance penalty.

Another approach could be to convert results from List[RunResult] to List[NodeResult] before we stick them in the Jinja context here.

For now, this is the safest & simplest way to restore the previous behavior.

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

All modified and coverable lines are covered by tests ✅

Project coverage is 88.23%. Comparing base (e349e01) to head (f16185f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10103      +/-   ##
==========================================
+ Coverage   88.18%   88.23%   +0.05%     
==========================================
  Files         181      181              
  Lines       22759    22770      +11     
==========================================
+ Hits        20069    20092      +23     
+ Misses       2690     2678      -12     

Flag	Coverage Δ
integration	85.61% <100.00%> (+0.12%)	⬆️
unit	62.66% <100.00%> (+<0.01%)	⬆️

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[github-actions]

The backport to 1.8.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-1.8.latest 1.8.latest
# Navigate to the new working tree
cd .worktrees/backport-1.8.latest
# Create a new branch
git switch --create backport-10103-to-1.8.latest
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 fe9e39dab8df083b0e06b6392afbf97a01eda0e6
# Push it to GitHub
git push --set-upstream origin backport-10103-to-1.8.latest
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-1.8.latest

Then, create a pull request where the base branch is 1.8.latest and the compare/head branch is backport-10103-to-1.8.latest.