fix: get price boundary logic, remove useless query, enhance ci

[owen-reorg]

Description

Change the boundary logic for getting the price is SP.

Rationale

Previously GetPriceByTime in SP module will return the latest price less than or equal to the given time.
It may cause a problem that the prices returned are different for a specific time.

Example

There are transactions in one block:

1. let p1 = get_price(now)
2. set_price(now, p2)
3. get_price(now) will return p2, which may be different with p1

We change the boundary logic to make it return the latest price less than(other than less than or equal to) the given time. Thus get_price(now) in step 3 will return p1. And for a specific parameter t in get_price, the result will always be the same.

Changes

Notable changes:

• get price boundary logic
• remove an useless query in payment module
• add a check in ci to ensure that the protobuf generated go files are always submitted together with the protobuf files change

[fynnss]

LGTM

Adjust the method of searching prices based on timestamp from [) to (] to address boundary issues.