feat(modern): remove inlined safari fix in csp 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

Idea is from vuejs/vue-cli#2741
Related issue: #4876

If csp is enabled without unsafe-inline, let's inject safari no-module fix as an external script.

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 #7306 into dev will decrease coverage by 0.27%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##              dev    #7306      +/-   ##
==========================================
- Coverage   62.87%   62.59%   -0.28%     
==========================================
  Files          84       84              
  Lines        3410     3425      +15     
  Branches      932      937       +5     
==========================================
  Hits         2144     2144              
- Misses       1018     1028      +10     
- Partials      248      253       +5     

Flag	Coverage Δ
#unittests	62.59% <0.00%> (-0.28%)	⬇️

Impacted Files	Coverage Δ
packages/webpack/src/config/client.js	0.00% <0.00%> (ø)
packages/webpack/src/plugins/vue/modern.js	3.77% <0.00%> (-0.68%)	⬇️

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[clarkdo]

Is it necessary for CSP to not inline scripts?

I think inline scripts is restricted by most csp users as it's safer.

And this pr is only user who are using all of spa, modern and csp users.