release-22.2.0: backupccl: use the backup codec when inspecting spans in the backupManifest #90528
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Backport 1/1 commits from #90477 on behalf of @msbutler.
/cc @cockroachdb/release
Informs #90475, #90474
Release note (bug fix): previously, during restore planning, the restoring cluster's codec was accidentally used to reason about spans in the backup manifest. When a backup was restored by a different tenant, two bugs described in #90475, #90474 could manifest. This patch fixes these bugs.
Release justification: bug fix