fix(webpack): no module scripts in spa modern client mode

[clarkdo]

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

Issue: #7562 (comment)

modern template will wait for legacy template until alterAssetTagGroups now, but this may still have racing condition if legacy build emits template file after modern build, this pr is changing to let modern template wait until legacy template is emtited.

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.

[pi0]

👍

[codecov-commenter]

Codecov Report

Merging #7967 into dev will increase coverage by 0.05%.
The diff coverage is 10.00%.

@@            Coverage Diff             @@
##              dev    #7967      +/-   ##
==========================================
+ Coverage   68.92%   68.98%   +0.05%     
==========================================
  Files          91       91              
  Lines        3846     3843       -3     
  Branches     1041     1041              
==========================================
  Hits         2651     2651              
+ Misses        971      968       -3     
  Partials      224      224              

Flag	Coverage Δ
#unittests	68.98% <10.00%> (+0.05%)	⬆️

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

Impacted Files	Coverage Δ
packages/webpack/src/plugins/vue/modern.js	3.70% <10.00%> (+0.19%)	⬆️

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