ci: update mon_data_avail_warn percentage
ci: update mon_data_avail_warn percentage

I see the mon_data_avail_warn is set to 500M
but acording to ceph doc this should be in percentage
And by default this percentage is 30%,
So re assigned to 10% for the CI

Closes: https://github.com/rook/rook/issues/11130
Signed-off-by: parth-gr <583be16d1c64273f0f691248fe7345d86bf42e7d@redhat.com>

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