ci: Workflow optimisations

[gsstoykov]

Description:
Introduces:

• Removed go vet step as golangci handles that. (~[-20] seconds of overall CI run time)
• Added parallel runs for e2e/unit tests. Unit tests do not start up the local-node (~[-2] minutes of overall CI run time)
• Removed old references to develop branch
• Removed jobs for testnet/mainnet/previewnet which were not working

Related issue(s):

Fixes #1207

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

see 3 files with indirect coverage changes

[gsstoykov]

@rbarkerSL Currently Unit and Integration Tests Expected — Waiting for status to be reported stays as required although having the same named step in our flow. Could the required tag be removed or is there a way to configure the Unit and Integration Tests to be the ones i changed to.

[0xivanov]

Looks good. Can you try to modify some source file in order to check how the codecov behaves with this change? We can revert the change in a next commit.

[gsstoykov]

@andrewb1269hg could you give me some insight here if Roger is not available - #1239 (comment)

[andrewb1269hg]

@andrewb1269hg could you give me some insight here if Roger is not available - #1239 (comment)

Once this PR merges to the mainline it will use the tests you've implemented, rather than the tests that currently exist.

I think we will need to override approval your PR to get it into the mainline, once others have reviewed it and there are no conflicts.

@rbarker-dev and I will discuss.

[0xivanov]

LGTM