fix: use merge semantics for Conda GlobalFiltered sync (Fixes #400) (… #1404

Job	Run time
Builds (macos-14, aarch64-apple-darwin, yes)	2m 25s
Tests (windows-latest, x86_64-pc-windows-msvc, yes)	11m 37s
Tests in Containers (ci-jupyter-container, ubuntu-latest, mcr.microsoft.com/devcontainers/univers...	4m 40s
Builds (ubuntu-latest, x86_64-unknown-linux-musl, yes)	2m 17s
Tests in Containers (ci-homebrew-container, ubuntu-latest, homebrew/brew, x86_64-unknown-linux-musl)	4m 14s
Env Tests (ci-poetry-project, ubuntu-latest, x86_64-unknown-linux-musl)	2m 41s
Builds (windows-latest, aarch64-pc-windows-msvc)	5m 25s
Tests (macos-latest, x86_64-apple-darwin, yes)	15m 11s
Env Tests (ci-poetry-global, ubuntu-latest, x86_64-unknown-linux-musl)	2m 47s
Builds (windows-latest, x86_64-pc-windows-msvc)	4m 52s
Env Tests (ci-poetry-global, windows-latest, x86_64-pc-windows-msvc)	6m 28s
Env Tests (ci-poetry-custom, windows-latest, x86_64-pc-windows-msvc)	6m 40s
Tests (ubuntu-latest, x86_64-unknown-linux-musl, yes)	9m 33s
Env Tests (ci-poetry-custom, ubuntu-latest, x86_64-unknown-linux-musl)	3m 1s
Env Tests (ci-poetry-project, windows-latest, x86_64-pc-windows-msvc)	9m 23s
Tests (macos-14, aarch64-apple-darwin, yes)	11m 12s
Builds (macos-latest, x86_64-apple-darwin, yes)	2m 44s
	1h 45m 10s

Provide feedback