refactor: use more import.meta.* properties

[DamianGlowala]

Continuation of #1301 addressing remaining occurences of process.*/process.env.*.

[cloudflare-workers-and-pages]

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 76.92308% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.20%. Comparing base (c37d889) to head (837d765).
⚠️ Report is 567 commits behind head on main.

Files with missing lines	Patch %	Lines
src/runtime/providers/netlifyLargeMedia.ts	50.00%	1 Missing ⚠️
src/runtime/providers/sanity.ts	0.00%	1 Missing ⚠️
src/runtime/utils/prerender.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1440      +/-   ##
==========================================
- Coverage   62.22%   62.20%   -0.03%     
==========================================
  Files          79       79              
  Lines        3595     3593       -2     
  Branches      390      390              
==========================================
- Hits         2237     2235       -2     
  Misses       1328     1328              
  Partials       30       30              

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