Don't use local plan cache for multi shard queries

[imranzaheer612]

GetCachedLocalPlan() should able to skip cache hit in case of multi-shard queries. A local plan cached should not used for multi shard queries.

Related Issues: https://github.com/citusdata/citus/issues/8330

[colm-mchugh]

Thanks for submitting this @imranzaheer612 , it looks like it fixes the issue. There's a couple of minor details:

• Need to run ci/editorconfig.sh from your branch's root dir to make check-style happy
• Rebase onto current main branch