fix: use merge semantics for Conda GlobalFiltered sync (Fixes #400) #1402

Job	Run time
Tests in Containers (ci-homebrew-container, ubuntu-latest, homebrew/brew, x86_64-unknown-linux-musl)	3m 56s
Tests (macos-latest, x86_64-apple-darwin, yes)	15m 12s
Builds (macos-14, aarch64-apple-darwin, yes)	2m 31s
Builds (ubuntu-latest, x86_64-unknown-linux-musl, yes)	2m 16s
Builds (windows-latest, aarch64-pc-windows-msvc)	4m 43s
Tests (ubuntu-latest, x86_64-unknown-linux-musl, yes)	9m 13s
Tests (macos-14, aarch64-apple-darwin, yes)	15m 12s
Builds (macos-latest, x86_64-apple-darwin, yes)	2m 6s
Tests (windows-latest, x86_64-pc-windows-msvc, yes)	10m 14s
Tests in Containers (ci-jupyter-container, ubuntu-latest, mcr.microsoft.com/devcontainers/univers...	4m 40s
Env Tests (ci-poetry-global, ubuntu-latest, x86_64-unknown-linux-musl)	2m 42s
Env Tests (ci-poetry-project, ubuntu-latest, x86_64-unknown-linux-musl)	2m 51s
Env Tests (ci-poetry-custom, windows-latest, x86_64-pc-windows-msvc)	5m 30s
Env Tests (ci-poetry-custom, ubuntu-latest, x86_64-unknown-linux-musl)	2m 58s
Env Tests (ci-poetry-global, windows-latest, x86_64-pc-windows-msvc)	5m 45s
Builds (windows-latest, x86_64-pc-windows-msvc)	4m 42s
Env Tests (ci-poetry-project, windows-latest, x86_64-pc-windows-msvc)	5m 31s
	1h 40m 2s

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