Improve documentation on E2E tests

[salasberryfin]

/kind documentation

Describe the solution you'd like
While working on #1053, I've encountered a few obstacles to run E2E tests locally and I haven't found the documentation to be very detailed on how E2E tests are actually structured and how to use them as a developer. Thanks to @richardcase, I've been able to identify a few things missing from my configuration but I think it would be great, especially for new or relatively new contributors, to have a nuanced, easy to follow documentation on how CAPG E2E tests are structured and how a user can leverage them to improve their development experience.

Anything else you would like to add:

This is the E2E section from the CAPZ book which can be used as a reference.

[professorabhay]

Hey @salasberryfin, Can I do this?

[salasberryfin]

Hey @professorabhay, thanks for volunteering to work on this. It would be better to have confirmation from any of the cluster-api-gcp-maintainers @richardcase @cpanato @dims.

[salasberryfin]

/assign

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/lifecycle stale

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/lifecycle rotten

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/close not-planned

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@k8s-triage-robot: Closing this issue, marking it as "Not Planned".

In response to this:

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

This bot triages issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
• After 30d of inactivity since lifecycle/rotten was applied, the issue is closed

You can:

• Reopen this issue with /reopen
• Mark this issue as fresh with /remove-lifecycle rotten
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Please send feedback to sig-contributor-experience at kubernetes/community.

/close not-planned

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