SEP-2350: accumulate scopes on step-up auth #2233

Job	Run time
checks / readme-snippets	11s
checks / pre-commit	34s
checks / test (3.13, lowest-direct, windows-latest)	2m 47s
checks / test (3.10, locked, windows-latest)	2m 18s
checks / test (3.13, locked, windows-latest)	2m 30s
checks / test (3.13, lowest-direct, ubuntu-latest)	55s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 21s
checks / test (3.12, locked, windows-latest)	3m 27s
checks / test (3.12, lowest-direct, ubuntu-latest)	59s
checks / test (3.10, lowest-direct, ubuntu-latest)	59s
checks / test (3.11, lowest-direct, ubuntu-latest)	54s
checks / test (3.10, locked, ubuntu-latest)	53s
checks / test (3.14, locked, windows-latest)	2m 34s
checks / test (3.13, locked, ubuntu-latest)	49s
checks / test (3.12, lowest-direct, windows-latest)	3m 56s
checks / test (3.10, lowest-direct, windows-latest)	2m 44s
checks / test (3.11, locked, windows-latest)	2m 30s
checks / test (3.11, lowest-direct, windows-latest)	2m 39s
checks / test (3.11, locked, ubuntu-latest)	53s
checks / test (3.12, locked, ubuntu-latest)	57s
checks / test (3.14, lowest-direct, windows-latest)	2m 24s
checks / test (3.14, locked, ubuntu-latest)	2m 32s
all-green	2s
	39m 48s

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