Move CI tasks to Taskfile.yml

[JonathanOppenheimer]

Why this should be merged

See issue 1023 in the coreth repository. @ceyonur requested that issue be addressed here too.

• Enables both discoverability of available tasks (./scripts/run_task.sh without arguments outputs all tasks) and maximizes the potential for reproducing what runs in CI - it can be as simple as task [ci job].
• Makes testing patterns consistent with the AvalancheGo repository and should reduce the complexity of the workflow.
• Simplifies the test-e2e-precompile by creating individual test tasks and then creating a parent task that runs everything.

How this works

Reassigns how scripts are called instead of directly calling them in workflow files.

How this was tested

As this changed how the unit tests themselves are executed, I will let the automatic unit tests run

Need to be documented?

No

Need to update RELEASES.md?

No

[ceyonur]

this overall lgtm, left few comments. we should get @maru-ava's approval.

[JonathanOppenheimer]

Additionally, the Golang unit tests for Windows need to be removed (see the 1 pending check below) - they obviously won't work anymore.

[maru-ava]

Just removal of run_env left...

[maru-ava]

Nice work!