Refactor code to remove test redundancy in limit_price_computer

[sonaalKant]

We want to remove the redundancy caused due to testing classes in the same hierarchy. We will refactor the common tests in the Testcase refer https://github.com/cryptokaizen/cmamp/blob/7a960f6d8f22d73dbb98a2c65552ce508e872074/docs/coding/all.write_unit_tests.how_to_guide.md?plain=1#L342

We would like to do the same for oms/limit_price_computer/test/