[BP MB-33392] - Index builds remains stuck when indexes on MAINT_STREAM are dropped before indexes on INIT_STREAM during rebalance

In https://issues.couchbase.com/browse/CBSE-6518, we noticed that when indexes on MAINT_STREAM are dropped before indexes on INIT_STREAM during rebalance, new index builds remain stuck. The num_docs_indexes is being shown as "0" but the build progress shows 100% and it does not change. The issue can be reproduced locally using the following steps:

• Set up a 2 node cluster - 1KV+n1ql,1index
• Populate 10M docs into "default" bucket
• Create and build an index idx_1
• After index idx_1 is built, start building another index idx_2
• When idx_2 is building, rebalance-in a KV node
• While the rebalance is happening and idx_2 is building, drop idx_1 first and then idx_2
• After rebalance finishes, create and build a new index idx_3
  • The index build for idx_3 remains stuck at 100% and the num_docs_indexed would be "0"