Don’t prefetch outside of production

[timneutkens]

Fixes #1827

This doesn't affect integration tests as they'd use next build which forces production mode. Development forces development.

[github-actions]

Stats from current PR

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	zeit/next.js canary	timneutkens/next.js fix/dont-prefetch-test	Change
Build Duration	16s	16s	⚠️ +0.26%
Client _app Size	2.67 kB	2.67 kB	✓
Client _app gzip Size	1.12 kB	1.12 kB	✓
Client _error Size	6.56 kB	6.56 kB	✓
Client _error gzip Size	2.77 kB	2.77 kB	✓
Client pages/index Size	288 B	288 B	✓
Client pages/index gzip Size	222 B	222 B	✓
Client main Size	20.2 kB	20.2 kB	✓
Client main gzip Size	6.77 kB	6.77 kB	✓
Client commons Size	190 kB	190 kB	✓
Client commons gzip Size	61.2 kB	61.2 kB	✓
Client webpack Size	1.49 kB	1.49 kB	✓
Client webpack gzip Size	769 B	769 B	✓
Base Rendered Size	1.2 kB	1.2 kB	✓
Build Dir Size	385 kB	385 kB	✓
Average Memory Usage	149 MB	148 MB	-0.51%
Max Memory Usage	208 MB	208 MB	0%
Average CPU Usage	95.91%	95.98%	⚠️ +0.07%
Max CPU Usage	110%	111.11%	⚠️ +1.01%
node_modules Size	42.8 MB	42.9 MB	⚠️ +0.19%

[ijjk]

Looks like the unit test needs to be updated but besides that lgtm

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Stats from current PR

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	zeit/next.js canary	timneutkens/next.js fix/dont-prefetch-test	Change
Build Duration	16s	15.7s	-1.68%
Client _app Size	2.67 kB	2.67 kB	✓
Client _app gzip Size	1.12 kB	1.12 kB	✓
Client _error Size	6.56 kB	6.56 kB	✓
Client _error gzip Size	2.77 kB	2.77 kB	✓
Client pages/index Size	288 B	288 B	✓
Client pages/index gzip Size	222 B	222 B	✓
Client main Size	20.2 kB	20.2 kB	✓
Client main gzip Size	6.77 kB	6.77 kB	✓
Client commons Size	190 kB	190 kB	✓
Client commons gzip Size	61.2 kB	61.2 kB	✓
Client webpack Size	1.49 kB	1.49 kB	✓
Client webpack gzip Size	769 B	769 B	✓
Base Rendered Size	1.2 kB	1.2 kB	✓
Build Dir Size	385 kB	385 kB	✓
Average Memory Usage	148 MB	147 MB	-0.67%
Max Memory Usage	208 MB	208 MB	-0.09%
Average CPU Usage	97.88%	93.68%	-4.29%
Max CPU Usage	111.11%	111.11%	✓
node_modules Size	42.8 MB	42.8 MB	0%

[github-actions]

Stats from current PR

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	zeit/next.js canary	timneutkens/next.js fix/dont-prefetch-test	Change
Build Duration	17.1s	19.2s	⚠️ +12.68%
Client _app Size	2.67 kB	2.67 kB	✓
Client _app gzip Size	1.12 kB	1.12 kB	✓
Client _error Size	6.56 kB	6.56 kB	✓
Client _error gzip Size	2.77 kB	2.77 kB	✓
Client pages/index Size	288 B	288 B	✓
Client pages/index gzip Size	222 B	222 B	✓
Client main Size	20.2 kB	20.2 kB	✓
Client main gzip Size	6.77 kB	6.77 kB	✓
Client commons Size	190 kB	190 kB	✓
Client commons gzip Size	61.2 kB	61.2 kB	✓
Client webpack Size	1.49 kB	1.49 kB	✓
Client webpack gzip Size	769 B	769 B	✓
Base Rendered Size	1.2 kB	1.2 kB	✓
Build Dir Size	385 kB	385 kB	✓
Average Memory Usage	147 MB	145 MB	-1.48%
Max Memory Usage	208 MB	201 MB	-3.28%
Average CPU Usage	95.91%	92.94%	-3.1%
Max CPU Usage	111.11%	122.22%	⚠️ +10%
node_modules Size	42.8 MB	42.8 MB	0%