fix(build): prevent styles leak to v8

[ShGKme]

☑️ Resolves

• We have styles encapsulation
• It uses content hash for encapsulation, so the same component code results in the same styles scope
• However, Vue 2 and Vue 3 components may have exactly the same code, which results in the same styles scope
• While runtime is different, for example, with v-bind in css feature
• It may result in Vue 2 component breaking the same Vue 3 component styles

• Example: NcIconToggleSwitch component. Tables app (Vue 2) breaks styles for Talk (Vue 3)

• Fix: add hash prefix to make it different from v8

🏁 Checklist

• ⛑️ Tests are included or are not applicable
• 📘 Component documentation has been extended, updated or is not applicable
• 2️⃣ Backport to stable8 for maintained Vue 2 version or not applicable

[ShGKme]

/backport! to stable8

[ShGKme]

/backport! to stable8

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 52.77%. Comparing base (1b98e06) to head (c83af2d).
⚠️ Report is 8 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8091   +/-   ##
=======================================
  Coverage   52.77%   52.77%           
=======================================
  Files         103      103           
  Lines        3348     3348           
  Branches      976      977    +1     
=======================================
  Hits         1767     1767           
  Misses       1333     1333           
  Partials      248      248           

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