runtime: remove TestCollisions from -short
runtime: remove TestCollisions from -short

Takes a bit too long to run it all the time.

Fixes #17217
Update #17104

Change-Id: I4802190ea16ee0f436a7f95b093ea0f995f5b11d
Reviewed-on: https://go-review.googlesource.com/29751
Run-TryBot: Keith Randall <8c99c3a9284e493be632950b84cd789d08ed3e9d@golang.org>
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>

Cofyc/go,goodlang/good,ImJasonH/go,CAFxX/go,cloudflare/go,cloudflare/go,josharian/go,polyverse-security/go,codestation/go,akutz/go,polyverse-security/go,nawawi/go,suncycheng/go,momchil-velikov/go,josharian/go,akutz/go,Cofyc/go,derekmarcotte/go,vsekhar/elastic-go,nawawi/go,goodlang/good,akutz/go,josharian/go,cloudflare/go,Cofyc/go,linux-on-ibm-z/go,momchil-velikov/go,polyverse-security/go,Cofyc/go,suncycheng/go,nawawi/go,vsekhar/elastic-go,cloudflare/go,linux-on-ibm-z/go,akutz/go,CAFxX/go,golang/go,nawawi/go,CAFxX/go,CAFxX/go,ImJasonH/go,CAFxX/go,cloudflare/go,CAFxX/go,derekmarcotte/go,josharian/go,polyverse-security/go,derekmarcotte/go,Cofyc/go,derekmarcotte/go,suncycheng/go,CAFxX/go,linux-on-ibm-z/go,suncycheng/go,golang/go,momchil-velikov/go,momchil-velikov/go,vsekhar/elastic-go,akutz/go,josharian/go,vsekhar/elastic-go,Cofyc/go,golang/go,codestation/go,cloudflare/go,golang/go,golang/go,goodlang/good,akutz/go,derekmarcotte/go,vsekhar/elastic-go,golang/go,polyverse-security/go,golang/go,polyverse-security/go,suncycheng/go,christopher-henderson/Go,momchil-velikov/go,codestation/go,momchil-velikov/go,cloudflare/go,akutz/go,ImJasonH/go,akutz/go,linux-on-ibm-z/go,vsekhar/elastic-go,linux-on-ibm-z/go,momchil-velikov/go,derekmarcotte/go,codestation/go,goodlang/good,linux-on-ibm-z/go,Cofyc/go,codestation/go,momchil-velikov/go,goodlang/good,golang/go,vsekhar/elastic-go,derekmarcotte/go,nawawi/go,goodlang/good,josharian/go,derekmarcotte/go,josharian/go,vsekhar/elastic-go,nawawi/go,CAFxX/go,suncycheng/go,nawawi/go,codestation/go,goodlang/good,polyverse-security/go,codestation/go,josharian/go,linux-on-ibm-z/go,ImJasonH/go,cloudflare/go,Cofyc/go,ImJasonH/go,ImJasonH/go,linux-on-ibm-z/go,codestation/go,ImJasonH/go,suncycheng/go,goodlang/good,polyverse-security/go,suncycheng/go,nawawi/go,ImJasonH/go