purge-old-deployments: Remove an unnecessary check.
purge-old-deployments: Remove an unnecessary check.

Deployments whose name is not in the format of a timestamp are
always included in the `recent_deployments` and are not deleted,
hence we don't need to check for them explicitly.

eeshangarg/zulip,tommyip/zulip,mahim97/zulip,verma-varsha/zulip,amanharitsh123/zulip,verma-varsha/zulip,dhcrzf/zulip,timabbott/zulip,brainwane/zulip,eeshangarg/zulip,hackerkid/zulip,kou/zulip,brockwhittaker/zulip,punchagan/zulip,jackrzhang/zulip,andersk/zulip,shubhamdhama/zulip,zulip/zulip,showell/zulip,zulip/zulip,amanharitsh123/zulip,jackrzhang/zulip,hackerkid/zulip,verma-varsha/zulip,rht/zulip,brainwane/zulip,timabbott/zulip,mahim97/zulip,kou/zulip,brockwhittaker/zulip,jackrzhang/zulip,shubhamdhama/zulip,kou/zulip,Galexrt/zulip,showell/zulip,Galexrt/zulip,tommyip/zulip,eeshangarg/zulip,zulip/zulip,rht/zulip,zulip/zulip,brainwane/zulip,shubhamdhama/zulip,hackerkid/zulip,rishig/zulip,synicalsyntax/zulip,showell/zulip,rht/zulip,punchagan/zulip,verma-varsha/zulip,synicalsyntax/zulip,kou/zulip,timabbott/zulip,Galexrt/zulip,mahim97/zulip,punchagan/zulip,brockwhittaker/zulip,synicalsyntax/zulip,amanharitsh123/zulip,eeshangarg/zulip,punchagan/zulip,rishig/zulip,showell/zulip,rishig/zulip,dhcrzf/zulip,showell/zulip,amanharitsh123/zulip,tommyip/zulip,tommyip/zulip,synicalsyntax/zulip,rht/zulip,hackerkid/zulip,brainwane/zulip,rishig/zulip,eeshangarg/zulip,shubhamdhama/zulip,punchagan/zulip,brockwhittaker/zulip,synicalsyntax/zulip,brainwane/zulip,mahim97/zulip,eeshangarg/zulip,tommyip/zulip,amanharitsh123/zulip,shubhamdhama/zulip,timabbott/zulip,dhcrzf/zulip,andersk/zulip,jackrzhang/zulip,shubhamdhama/zulip,brainwane/zulip,timabbott/zulip,andersk/zulip,amanharitsh123/zulip,kou/zulip,rishig/zulip,zulip/zulip,verma-varsha/zulip,brockwhittaker/zulip,dhcrzf/zulip,punchagan/zulip,Galexrt/zulip,mahim97/zulip,jackrzhang/zulip,andersk/zulip,mahim97/zulip,jackrzhang/zulip,hackerkid/zulip,synicalsyntax/zulip,eeshangarg/zulip,tommyip/zulip,timabbott/zulip,Galexrt/zulip,tommyip/zulip,zulip/zulip,synicalsyntax/zulip,hackerkid/zulip,zulip/zulip,verma-varsha/zulip,brainwane/zulip,dhcrzf/zulip,Galexrt/zulip,jackrzhang/zulip,rishig/zulip,andersk/zulip,kou/zulip,dhcrzf/zulip,hackerkid/zulip,Galexrt/zulip,shubhamdhama/zulip,kou/zulip,punchagan/zulip,rht/zulip,showell/zulip,rht/zulip,showell/zulip,rht/zulip,dhcrzf/zulip,rishig/zulip,andersk/zulip,timabbott/zulip,brockwhittaker/zulip,andersk/zulip