main/fish: remove completion for docker, provided by upstream

closes #12186
7 jobs for !15693 with fish in 38 seconds (queued for 2 seconds)
detached
Status Job ID Name Coverage
  Lint
failed #269273
docker-alpine x86_64 allowed to fail
lint

00:00:06

 
  Build
failed #269278
docker-alpine ci-build aarch64
build-aarch64

00:00:08

failed #269279
docker-alpine ci-build armv7
build-armv7

00:00:28

failed #269277
docker-alpine ci-build ppc64le
build-ppc64le

00:00:08

failed #269276
docker-alpine ci-build s390x
build-s390x

00:00:08

failed #269275
docker-alpine ci-build x86
build-x86

00:00:04

failed #269274
docker-alpine ci-build x86_64
build-x86_64

00:00:10

 
Name Stage Failure
failed
lint Lint
No job log
failed
build-ppc64le Build
No job log
failed
build-s390x Build
No job log
failed
build-x86_64 Build
No job log
failed
build-aarch64 Build
No job log
failed
build-x86 Build
No job log
failed
build-armv7 Build
No job log