[milo] remove inline dev-server script injestion
[milo] remove inline dev-server script injestion

This is no longer needed after upgrading to dev-server v4

R=mdraz@google.com, 7f5d2f4f6ce87649784e35ad551490ab8d89e8eb@google.com

Bug: None
Change-Id: Ifda7a58b205b0272e10e1053eea7a178dc145341
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/luci-go/+/3689130
Auto-Submit: Weiwei Lin <968518a24f41fef00b747498600e52b792d06ae0@google.com>
Reviewed-by: Tuan Nguyen <7f5d2f4f6ce87649784e35ad551490ab8d89e8eb@google.com>
Commit-Queue: Tuan Nguyen <7f5d2f4f6ce87649784e35ad551490ab8d89e8eb@google.com>

luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go