chore(migrations): drop unneeded altitude bare-metres migrator #267

Job	Run time
unit tests	3m 27s
script upgrade (stable main)	50s
mounted image upgrade (legacy contract)	51s
mounted image upgrade (new contract)	1m 13s
lint	24s
image build mode	16s
script upgrade (pre-schema-split pin)	52s
webconfig drift	1m 12s
script install (debian:13, bootstrap)	45s
script install (ubuntu:24, bundle)	47s
script install (debian:13, bundle)	49s
script install (ubuntu:24, bootstrap)	52s
webconfig drift	1m 4s
script upgrade (stable main)	50s
lint	24s
mounted image upgrade (legacy contract)	51s
unit tests	3m 27s
mounted image upgrade (new contract)	1m 13s
script install (ubuntu:24, bundle)	47s
script upgrade (pre-schema-split pin)	52s
script install (debian:13, bootstrap)	45s
script install (ubuntu:24, bootstrap)	52s
image build mode	16s
script install (debian:13, bundle)	49s
	24m 28s

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