[TT-791] Migrate OCRv1/v2 tests from EVMClient to Seth

[Tofel]

What was done:

• all OCRv1/v2 load & soak tests use Seth
• OCRv2 smoke tests use Seth
• Seth was added as an option to docker test environment builder
• added Seth-based versions of OCR helpers
• left existing OCR helper mainly unchanged, so that no downstream projects are forced to migrate, when they merge core repo
• added Seth-specific wrappers for Ethereum contracts, renamed ones using EVMClient to Legacy*
• added a small fix for forwarder OCR tests to make them compatible with OCR v2 (and made sure that this variant passes)
• removed some methods from old contract interfaces that weren't used anywhere
• added chain of responsibility-based handling of errors during return of funds (something that imho should be placed in CTF) [tested on Polygon Mumbai]
• unified some functions with their _local equivalents by introducing smallest possible surface interfaces that define methods common to local and k8s Chainlink client (because method signature was the only difference between two functions)
• included bash script to set base64 override, when running soak/load tests via Make

General approach to migration:

• do not remove any existing helper functions and limit their modifications to minimum
• add parallel Seth-based helpers and use them in tests
• once all tests and helpers have been migrated sync with downstream projects and schedule their migration
• once all downstream projects are migrated remove legacy helper functions and contract wrappers

Log created by funds returning retrier:

    log.go:43: 12:09:00.57 INF Attempting to return Chainlink node funds to default network wallets
    log.go:43: 12:09:04.54 INF Overshot error detected, retrying with less funds
    log.go:43: 12:09:34.97 DBG New amount to send diff=2100000000000000 new amount=97430379995303806 old amount=99530379995303806 retier=OvershotTransferRetrier
    log.go:43: 12:09:52.18 DBG Awaiting transaction
    log.go:43: 12:09:53.18 INF Transaction accepted BlockNumber=46380080
    log.go:43: 12:09:53.18 INF Retry successful retier=OvershotTransferRetrier

Sample WASP run logs:

1:52PM INF Finished all schedule segments Component=ocr RPS=0 Segment=1 VUs=1
1:52PM INF Scheduler exited Component=ocr
1:52PM INF Load stats CallTimeout=0 Component=ocr Failed=0 Success=25
1:52PM INF Stats loop exited Component=ocr
1:52PM INF Collect data exited Component=ocr
1:52PM INF Loki responses exited Component=ocr
1:53PM INF Loki stats exited Component=ocr
1:53PM INF Stopping Loki Component=ocr
1:53PM INF Loki exited Component=ocr
--- PASS: TestOCRVolume (220.23s)

[github-actions]

I see that you haven't updated any README files. Would it make sense to do so?

[github-actions]

I see that you haven't updated any CHANGELOG files. Would it make sense to do so?

[kalverra]

I'm curious why we pass in functions for this instead of just asking for the data directly? Is it more concise?

[Tofel]

I thought that this way we don't have copy & paste or encapsulate in yet another method the different codes that retrieve these addresses from nodes or forwarder contracts

[cl-sonarqube-production]

Quality Gate passed

Issues
5 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
1.8% Duplication on New Code

See analysis details on SonarQube