LU-18335 tests: skip conf-sanity/136 in interop

LU-18335 tests: skip conf-sanity/136 in interop

conf-sanity test_136 was added to test the fix for a bug
that crashes the MDS, so skip it during interop testing.

Test-Parameters: trivial testlist=conf-sanity env=ONLY=136
Test-Parameters: testlist=conf-sanity env=ONLY=136 serverversion=2.15
Fixes: 55c143a66d ("LU-15784 obdecho: don't panic with run on second mdt")
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: Iec0f96387bf69218ee74b88cce5ab21e07004292
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/56638
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Jian Yu <yujian@whamcloud.com>
Reviewed-by: Minh Diep <mdiep@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>