Merge to stable-23-3: making blockstore cluster survive after destruction of static BS group in local-emergency test

[SvartMetal]

• silence 'E_NOT_IMPLEMENTED Disk registry based disks can not handle GetChangedBlocks requests' error (silence 'E_NOT_IMPLEMENTED Disk registry based disks can not handle GetChangedBlocks requests' error #1972)
• issue-757: refactor local-emergency load-test making it actually turn on emergency mode; increment suggested generation upon external boot in fallback mode; minor tweaks (issue-757: refactor local-emergency load-test making it actually turn on emergency (fallback) mode; increment suggested generation upon external boot in fallback mode; minor tweaks #2019)
• issue-757: don't load configs from CMS in emergency mode (issue-757: don't load configs from CMS in emergency mode #2042)
• issue-757: pass path as empty TMaybe instead of empty TString when registering node in Node Broker; spoil BS Controller config before restarting Kikimr after formatting static pdisks in local-emergency test (otherwise BS Controller would erase all the data from other non-static groups) (issue-757: pass path as empty TMaybe<TString> instead of empty TString when registering node in Node Broker; spoil BS Controller config before restarting Kikimr after formatting static pdisks in local-emergency test (otherwise BS Controller would erase all the data from other non-static groups) #2049)

#757

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🔴 default-linux-x86-64-relwithdebinfo: some tests FAILED for commit 3ec2986.

	TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
CTest	1551	1550	0	1	0	0
CTest Rerun	1	1	0	0	0	0