lint: Get rid of unused skip_rules.
lint: Get rid of unused skip_rules.

We also go to the modern annotation style for mypy.

rishig/zulip,synicalsyntax/zulip,showell/zulip,timabbott/zulip,tommyip/zulip,andersk/zulip,zulip/zulip,kou/zulip,hackerkid/zulip,timabbott/zulip,hackerkid/zulip,rishig/zulip,zulip/zulip,eeshangarg/zulip,andersk/zulip,tommyip/zulip,synicalsyntax/zulip,punchagan/zulip,kou/zulip,punchagan/zulip,showell/zulip,timabbott/zulip,rishig/zulip,punchagan/zulip,eeshangarg/zulip,rht/zulip,hackerkid/zulip,showell/zulip,shubhamdhama/zulip,rht/zulip,brainwane/zulip,punchagan/zulip,dhcrzf/zulip,brainwane/zulip,andersk/zulip,tommyip/zulip,tommyip/zulip,showell/zulip,timabbott/zulip,zulip/zulip,eeshangarg/zulip,shubhamdhama/zulip,zulip/zulip,rht/zulip,tommyip/zulip,kou/zulip,eeshangarg/zulip,eeshangarg/zulip,dhcrzf/zulip,hackerkid/zulip,andersk/zulip,jackrzhang/zulip,rht/zulip,brainwane/zulip,timabbott/zulip,kou/zulip,timabbott/zulip,tommyip/zulip,eeshangarg/zulip,showell/zulip,brainwane/zulip,zulip/zulip,dhcrzf/zulip,jackrzhang/zulip,jackrzhang/zulip,kou/zulip,eeshangarg/zulip,andersk/zulip,dhcrzf/zulip,synicalsyntax/zulip,shubhamdhama/zulip,zulip/zulip,punchagan/zulip,dhcrzf/zulip,synicalsyntax/zulip,rht/zulip,rht/zulip,kou/zulip,punchagan/zulip,jackrzhang/zulip,brainwane/zulip,dhcrzf/zulip,synicalsyntax/zulip,jackrzhang/zulip,shubhamdhama/zulip,timabbott/zulip,andersk/zulip,shubhamdhama/zulip,shubhamdhama/zulip,hackerkid/zulip,rishig/zulip,synicalsyntax/zulip,andersk/zulip,showell/zulip,hackerkid/zulip,dhcrzf/zulip,zulip/zulip,jackrzhang/zulip,rht/zulip,synicalsyntax/zulip,punchagan/zulip,brainwane/zulip,rishig/zulip,rishig/zulip,jackrzhang/zulip,shubhamdhama/zulip,kou/zulip,hackerkid/zulip,brainwane/zulip,rishig/zulip,tommyip/zulip,showell/zulip