Add one-call automatic background estimation for powder patterns (#193) #401

Job	Run time
env-prepare	3s
source-test (macos-15)	13m 22s
source-test (windows-2022)	26m 5s
source-test (ubuntu-24.04)	16m 57s
package-test (windows-2022)	25m 3s
package-test (ubuntu-24.04)	15m 7s
package-test (macos-15)	12m 32s
run-reusable-workflows / dashboard	2m 14s
	1h 51m 23s

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