Goth examples on CI

[approxit]

What I've done:

• Added all non-outbound vm examples on CI to be run nightly at 2 AM
• Removed default usage of outbound pypi URL (to ease example running)
• Fixed Terminate node does not cancel its pending creation #197
• Made SSH check fails able to retry activity creation
• Removed hostname resolution dependency in simple-task and simple-actor examples, as sometimes goth instances had problems with their stability
• Fixed outdated node_config layout in mendelbrot yaml example
• Made node_config raise errors on unrecognized fields (to mitigate the previous element from this list)
• Fixed CI warnings about outdated node versions, by bumping versions of a few GHA steps
• Made yagna running checks explicit about the used URL
• Fixed problems with failing yagna funds on CI, by making its timeout a little bigger

Notable remarks:

• We decided that examples will be run not on pull requests and as nighty due to current problems with ssh stability