[Bug] rest api for /blocks?start=...&end=... does not include last block

[andrezorzo]

🐛 Bug Report

This is a low priority bug.

The documentation says that GET /testnet/blocks?start={start_height}&end={end_height} should return blocks from the given block range, but when requested with start=1&end=2, the output is not including the block 2, and the response is a list with only block 1. Also, if provided start=1&end=1 it will not return any blocks.

Steps to Reproduce

Just curl the rest api with any block range:

curl 'http://127.0.0.1:3030/canary/blocks?start=1&end=2' | jq '.[].header.metadata.height'
1

curl 'http://127.0.0.1:3030/canary/blocks?start=1&end=3' | jq '.[].header.metadata.height'
1
2

Expected Behavior

Expected that when requested a block range, all the blocks in the range should be returned.

[raychu86]

Same issue as #3394.

Here is some context - #3394 (comment)