Delete old objects when calling `ObjectStore::put` #4584

Job	Run time
check examples (ubuntu-latest / stable)	31s
check docs (ubuntu-latest / stable)	29s
check feature flags (ubuntu-latest / stable)	15m 28s
check format (ubuntu-latest / nightly)	10s
check licenses (ubuntu-latest / stable)	24s
check linter (ubuntu-latest / stable)	45s
check minimal versions of transitive dependencies (ubuntu-latest / stable)	25s
check minimal supported rust version (ubuntu-latest / msrv)	17s
check spelling (ubuntu-latest / nightly)	5m 52s
test (ubuntu-latest / stable)	7m 27s
test (macos-latest / stable)	6m 30s
test (windows-latest / stable)	9m 22s
	47m 40s

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