feat: add MCP HTTP server experiment and improve experiment middleware#18712

ThomasK33 wants to merge 1 commit intothomask33/07-01-feat_oauth2_replace_dev_flag_with_oauth2_experiment_for_controlled_rolloutcoder/coder:thomask33/07-01-feat_oauth2_replace_dev_flag_with_oauth2_experiment_for_controlled_rolloutfrom

thomask33/07-02-feat_mcp_add_experiment_control_for_mcp_server_http_endpointscoder/coder:thomask33/07-02-feat_mcp_add_experiment_control_for_mcp_server_http_endpointsCopy head branch name to clipboard