fix(vue-renderer): clone spa meta to prevent cache modification

[ustun]

This ensures that post-processing of the result object does not cause cache corruption.

When transforming the response in SPA mode via render:route hook, setting result.html changes the data in cache, which is not ideal.

Fixes #5962

Types of changes

• Bug fix (a non-breaking change which fixes an issue)
• New feature (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Description

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly. (PR: #)
• I have added tests to cover my changes (if not applicable, please state why)
• All new and existing tests are passing.

[codecov-io]

Codecov Report

Merging #5964 into dev will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##              dev    #5964   +/-   ##
=======================================
  Coverage   95.68%   95.68%           
=======================================
  Files          82       82           
  Lines        2689     2689           
  Branches      690      690           
=======================================
  Hits         2573     2573           
  Misses         98       98           
  Partials       18       18

Flag	Coverage Δ
#e2e	100% <ø> (ø)	⬆️
#fixtures	50.35% <0%> (ø)	⬆️
#unit	92.67% <100%> (ø)	⬆️

Impacted Files	Coverage Δ
packages/vue-renderer/src/renderers/spa.js	87.5% <100%> (ø)	⬆️

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[ustun]

Is this stuck because the commit starts with Fix instead of fix? I'm not very familiar with semantic pull request bot.

[pi0]

@ustun no PR is ok and thanks for that ❤️ Sorry for late review.