TORONTO, April 30 (Reuters) - As Canada's largest strike by federal workers approaches its third week, thousands of people are in immigration limbo amid canceled hearings and stalled applications, which could make it harder for the country to compete for global talent as employers face a tight labour market. Canada has raised its immigration target to record-setting levels and hopes to bring in 500,000 new permanent residents a year by 2025 to help ease labour shortages in industries from construction to healthcare. An immigration system perceived to be dysfunctional could complicate efforts to woo talented immigrants, said immigration lawyer Guidy Mamann