fix: remove zisi_pure_esm feature flag from ZISI

[eduardoboucas]

Summary

Temporarily remove this feature flag until netlify/zip-it-and-ship-it#1038 is addressed.

[github-actions]

📊 Benchmark results

Comparing with 8df364e

Package size: 443 MB

(no change)

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└───┴──┴────┴──┴────┴──┴────┴──┴────┴──┴────┴──┴────┴──┴────┴──┴────┴──┴────┴──┴────┴──┴────┴──┴────┴──┴──>
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Legend

• T-30 (8df364e): 443 MB
• T-29 (3db51e2): 443 MB
• T-28 (eecb146): 443 MB
• T-27 (550c5c0): 443 MB
• T-26 (b3f0522): 443 MB
• T-25 (983b2a5): 443 MB
• T-24 (6729dfd): 443 MB
• T-23 (bfadc76): 443 MB
• T-22 (870644f): 443 MB
• T-21 (c78a716): 443 MB
• T-20 (1870e54): 443 MB
• T-19 (4d58a44): 443 MB
• T-18 (3b7765c): 443 MB
• T-17 (88985c4): 443 MB
• T-16 (110eed6): 443 MB
• T-15 (cd3787c): 443 MB
• T-14 (d9f62e0): 443 MB
• T-13 (fad5ef6): 443 MB
• T-12 (5ea7686): 447 MB
• T-11 (483f51a): 447 MB
• T-10 (7ef657d): 447 MB
• T-9 (2decc3e): 447 MB
• T-8 (69261cd): 443 MB
• T-7 (0c0fded): 443 MB
• T-6 (9155efb): 443 MB
• T-5 (73793bf): 443 MB
• T-4 (809f9d7): 443 MB
• T-3 (ed66573): 443 MB
• T-2 (9c89252): 443 MB
• T-1 (88be608): 443 MB
• T (current commit): 443 MB