Update @wordpress/env to v11, split .wp-env.json

[ockham]

Update @wordpress/env to v11, and split .wp-env.json into two separate files, one for the dev environment, one for tests. See WordPress/gutenberg#75341 for more context.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 31.56%. Comparing base (8b53724) to head (2c029a9).

❗ There is a different number of reports uploaded between BASE (8b53724) and HEAD (2c029a9). Click for more details.

HEAD has 7 uploads less than BASE

Flag	BASE (8b53724)	HEAD (2c029a9)
phpunit	6	2
javascript	3	0

Additional details and impacted files

@@             Coverage Diff              @@
##              trunk     #366      +/-   ##
============================================
- Coverage     37.84%   31.56%   -6.28%     
============================================
  Files           298      283      -15     
  Lines         39399    37702    -1697     
============================================
- Hits          14909    11901    -3008     
- Misses        24490    25801    +1311     

Flag	Coverage Δ
e2e-php	0.00% <ø> (-22.69%)	⬇️
javascript	?
phpunit	29.97% <ø> (ø)

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