Move conda installation from deprecated DEBs to Miniconda installer #2938

Job	Run time
detect-changes	3s
test-scenarios (conda)	4m 12s
test (conda, debian:12)	1m 3s
test (conda, debian:11)	54s
test (conda, ubuntu:jammy)	53s
test (conda, ubuntu:focal)	50s
test (conda, mcr.microsoft.com/devcontainers/base:debian)	1m 4s
test (conda, mcr.microsoft.com/devcontainers/base:ubuntu)	52s
test (conda, mcr.microsoft.com/devcontainers/base:noble)	59s
	10m 50s

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