release-21.2: sql: support for temporary table clean up for tenants #70129
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Backport 1/2 commits from #69486.
/cc @cockroachdb/release
Fixes #67401
Fixes: #67401
Previously, the temporary table clean-up did not execute for
tenants. This was inadequate that temporary tables would last
longer than the life span of user sessions. To address this,
this patch adds support for cleaning up on a single tenant
pod. Specifically removing checks for meta1 lease when under
a tenant, and support for listing sessions.
Release justification: low risk and fixes a tenant-related bug
Release note (bug fix): Temporary tables were not properly cleaned up for
tenants.