feat: Add EnterpriseOwner as bypass actor type for rulesets

[nitinjain999]

Closes #3210
Supersedes #3211

Picking up from @jackmtpt who did the initial work in #3211.

The issue is straightforward — EnterpriseOwner was missing from the actor_type validation list in both github_organization_ruleset and github_repository_ruleset, so using it would fail with a validation error even though the GitHub API supports it fine.

Changes:

• Add EnterpriseOwner to the actor_type allowlist in both resources
• Update actor_id description to note it should be left unset for OrganizationAdmin, EnterpriseOwner, and DeployKey — the API ignores it for those types
• Remove actor_id = 1 from OrganizationAdmin blocks in existing tests (flagged by @deiga — same deal, API ignores it)
• New acceptance tests for EnterpriseOwner bypass, enterprise-gated with skipUnlessEnterprise and using ConfigStateChecks
• Docs updated in docs/resources/ — website/docs/ no longer exists on main

Tested against a live enterprise org. Create, plan (no drift on second run), destroy all worked. One thing to flag: the API returns actor_id: 0 for EnterpriseOwner on read, so if you expose bypass_actors as an output you'll see a null → 0 change on the first plan after apply. Resource itself has no diff though — same behaviour as OrganizationAdmin.

[github-actions]

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