Single transaction is get regular refs and remove unused ref index

[Hitenjain14]

Changes

Fixes

Tests

Tasks to complete before merging PR:

• [ ] Ensure system tests are passing. If not Run them manually to check for any regressions :clipboard:
• [ ] Do any new system tests need added to test this change? do any existing system tests need updated? If so create a PR at 0chain/system_test
• [ ] Merge your system tests PR to master AFTER merging this PR

Associated PRs (Link as appropriate):

• 0chain:
• gosdk:
• system_test: https://github.com/0chain/system_test/pull/1073
• zboxcli:
• zwalletcli:
• Other: ...

[service-0chain]

Manual system tests [failure] with the following config	config	value
tests skipped	false
system-tests
gosdk	NOT OVERRIDDEN
zboxcli
zwalletcli
0chain
blobber	feat/ref-index
authorizer
0box
0dns