stake: Remove feature `stake_merge_with_unmatched_credits_observed` (… #95

Job	Run time
android (ubuntu-20.04, x86_64-linux-android)	2m 52s
android (ubuntu-20.04, aarch64-linux-android)	2m 59s
android (ubuntu-20.04, i686-linux-android)	3m 6s
android (ubuntu-20.04, armv7-linux-androideabi)	3m 15s
ios (macos-11, aarch64-apple-ios)	6m 14s
ios (macos-11, x86_64-apple-ios)	5m 48s
ios (macos-11, aarch64-apple-darwin)	6m 21s
ios (macos-11, x86_64-apple-darwin)	6m 3s
error_reporting	0s
	36m 38s

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