integrations_dev_panel: Convert loaded_fixtures from object to Map.
integrations_dev_panel: Convert loaded_fixtures from object to Map.

Signed-off-by: Anders Kaseorg <dfdb7392591db597bc41cf266a9c3bc12a2706e5@zulipchat.com>

rht/zulip,eeshangarg/zulip,hackerkid/zulip,showell/zulip,timabbott/zulip,brainwane/zulip,showell/zulip,timabbott/zulip,brainwane/zulip,shubhamdhama/zulip,shubhamdhama/zulip,andersk/zulip,synicalsyntax/zulip,punchagan/zulip,kou/zulip,hackerkid/zulip,rht/zulip,zulip/zulip,hackerkid/zulip,zulip/zulip,andersk/zulip,punchagan/zulip,shubhamdhama/zulip,zulip/zulip,andersk/zulip,punchagan/zulip,kou/zulip,rht/zulip,showell/zulip,zulip/zulip,showell/zulip,kou/zulip,showell/zulip,timabbott/zulip,rht/zulip,eeshangarg/zulip,punchagan/zulip,rht/zulip,zulip/zulip,timabbott/zulip,brainwane/zulip,synicalsyntax/zulip,zulip/zulip,eeshangarg/zulip,hackerkid/zulip,zulip/zulip,punchagan/zulip,rht/zulip,brainwane/zulip,timabbott/zulip,showell/zulip,synicalsyntax/zulip,kou/zulip,brainwane/zulip,punchagan/zulip,rht/zulip,timabbott/zulip,timabbott/zulip,punchagan/zulip,kou/zulip,andersk/zulip,eeshangarg/zulip,hackerkid/zulip,showell/zulip,shubhamdhama/zulip,synicalsyntax/zulip,eeshangarg/zulip,hackerkid/zulip,kou/zulip,andersk/zulip,brainwane/zulip,eeshangarg/zulip,andersk/zulip,shubhamdhama/zulip,synicalsyntax/zulip,shubhamdhama/zulip,andersk/zulip,kou/zulip,brainwane/zulip,synicalsyntax/zulip,eeshangarg/zulip,shubhamdhama/zulip,synicalsyntax/zulip,hackerkid/zulip