fix add_history_entry validation to ignore custom schema #4147

Job	Run time
pre-commit	9s
type-checking	19s
jsonschema	0s
core / Load tox environments	9s
core / Python 3.12 coverage	1m 42s
core / Python 3.13 coverage	1m 44s
core / Python 3.11 coverage	1m 44s
core / Python 3.10 coverage	1m 56s
core / Python 3.14 coverage	1m 18s
asdf-schemas / Load tox environments	9s
test / Load tox environments	9s
compatibility / Load tox environments	8s
oldest / Load tox environments	7s
mocks3 / Load tox environments	8s
dev / Load tox environments	6s
core / report overall test coverage	0s
asdf-schemas / asdf-transform-schemas (ubuntu-latest)	1m 11s
asdf-schemas / asdf-standard (ubuntu-latest)	44s
dev / py310-coverage-devdeps-parallel (ubuntu-latest)	1m 54s
dev / py312-coverage-devdeps-parallel (ubuntu-latest)	1m 48s
dev / py314-coverage-pytestdev-parallel (ubuntu-latest)	1m 15s
dev / py313-coverage-devdeps-parallel (ubuntu-latest)	1m 44s
dev / py311-coverage-devdeps-parallel (ubuntu-latest)	1m 42s
dev / py314-coverage-devdeps-parallel (ubuntu-latest)	1m 44s
oldest / py310-oldestdeps-parallel (ubuntu-latest)	55s
test / py311-parallel (macos-latest)	56s
test / py311-parallel (windows-latest)	2m 30s
compatibility / compatibility (ubuntu-latest)	4m 29s
mocks3 / mocks3 (ubuntu-latest)	50s
mocks3 / report overall test coverage	0s
oldest / report overall test coverage	0s
asdf-schemas / report overall test coverage	0s
dev / report overall test coverage	0s
test / report overall test coverage	0s
compatibility / report overall test coverage	0s
	31m 30s

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