test: deflake `test-shadow-realm-gc`
This PR deflakes the test-shadow-realm-gc
test by upping the max-old-space-size
from 20
to 25
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
This PR deflakes the test-shadow-realm-gc
test by upping the max-old-space-size
from 20
to 25