tests: decrease redundancy in utils for different protocols

[danisharora099]

This is a change request

Problem

We have different utils being setup for different tests, specifically protocols. This, in places, is starting to get redundant and would be good to keep /tests/ folder strictly spec files while all utils can live in /src/ instead (along with other utils)

Proposed Solutions

Abstract away different utils like https://github.com/waku-org/js-waku/blob/master/packages/tests/tests/filter/utils.ts and

js-waku/packages/tests/tests/store/utils.ts

Line 103 in 04bd518

export async function startAndConnectLightNode(

into root level utils (in /src perhaps)

Notes

[weboko]

Another point to address #2085 (comment):

• stop using createLightNode/createRelayNode directly and instead create createTestLightNode/createTestRelayNode util that will be configured for DefaultTestShardInfo and other test defaults;
• remove runNode/runStoreNode/runNodeBuilder/runNodes utils in favor of one and do not pass any shardInfo as it defaults to DefaultTestShardInfo;
• remove all custom const PubsubTopics/ShardInfo etc and use only DefaultTestShardInfo/DefaultTestPubsubTopic;