Devcontainer: Comment out Github Copilot extension #825

Job	Run time
test-definitions / run-sailbot-workspace-ci	0s
test-definitions / extract-metadata	3s
test-definitions / merge-dependabot-pr	0s
test-definitions / markdown-link-check	25s
test-definitions / clang-tidy	7m 47s
test-definitions / colcon-test	3m 18s
test-definitions / ament_lint_cmake	1m 31s
test-definitions / ament_flake8	1m 32s
test-definitions / ament_mypy	1m 43s
test-definitions / ament_xmllint	1m 25s
test-definitions / markdownlint	15s
test-definitions / rebuild-docs	0s
	17m 59s

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