Cache key collision in render checks for suggestions

[vinceh121]

Proposed changes

There is a cache key collision between renders generated in checks for the unit and for its suggestions.

How to reproduce the collision:

1. Create a component with the max-size check
2. Create a unit in the source language and translate it in a target language
3. The render check (whether valid or incorrect) will display the render for the target string
4. Add a different suggestion to the same unit
5. The render check will display the render for the suggestion instead of the target string

Checklist

• Lint and unit tests pass locally with my changes.
• I have added tests that prove my fix is effective or that my feature works.
• I have added documentation to describe my feature.
• I have squashed my commits into logic units.
• I have described the changes in the commit messages.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 91.14%. Comparing base (8d08fc0) to head (119b46f).
Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
weblate/trans/models/suggestion.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12673      +/-   ##
==========================================
- Coverage   91.14%   91.14%   -0.01%     
==========================================
  Files         596      596              
  Lines       60939    60940       +1     
  Branches     9646     9646              
==========================================
  Hits        55545    55545              
- Misses       3723     3724       +1     
  Partials     1671     1671              

Files with missing lines	Coverage Δ
weblate/trans/models/suggestion.py	80.00% <0.00%> (-0.60%)	⬇️