Prepare ci tools for extensions without DuckDB submodule #135

Job	Run time
Extension template / Generate matrix	29s
Rust builds (using Delta extension) / Generate matrix	24s
Rust builds (using Delta extension) / DuckDB-Wasm	0s
Rust builds (using Delta extension) / Windows	0s
Rust builds (using Delta extension) / Linux (linux_amd64, ubuntu:18.04, x64-linux)	10m 11s
Rust builds (using Delta extension) / MacOS (osx_amd64, x86_64, x64-osx)	10m 17s
Rust builds (using Delta extension) / Linux (linux_amd64_gcc4, quay.io/pypa/manylinux2014_x86_64, x64-linux)	10m 11s
Rust builds (using Delta extension) / MacOS (osx_arm64, arm64, arm64-osx)	7m 57s
Rust builds (using Delta extension) / Linux (linux_arm64, ubuntu:18.04, arm64-linux)	10m 11s
Extension template / DuckDB-Wasm (wasm_mvp, wasm32-emscripten)	3m 26s
Extension template / Windows (windows_amd64, x64-windows-static-md)	9m 51s
Extension template / Linux (linux_amd64, ubuntu:18.04, x64-linux)	8m 1s
Extension template / MacOS (osx_amd64, x86_64, x64-osx)	3m 36s
Extension template / Linux (linux_amd64_gcc4, quay.io/pypa/manylinux2014_x86_64, x64-linux)	7m 45s
Extension template / DuckDB-Wasm (wasm_eh, wasm32-emscripten)	3m 49s
Extension template / Windows (windows_amd64_rtools, x64-mingw-static)	9m 56s
Extension template / MacOS (osx_arm64, arm64, arm64-osx)	2m 9s
Extension template / Linux (linux_arm64, ubuntu:18.04, arm64-linux)	8m 5s
Extension template / DuckDB-Wasm (wasm_threads, wasm32-emscripten)	3m 55s
	1h 50m 13s

Provide feedback