feat: use provider owner as default for github_organization data source

[mattias-fjellstrom]

Summary

When no name is provided to the github_organization data source, it now falls back to the provider's configured owner (or the authenticated user if no owner is set). This makes name optional.

Motivation

Users who already configure an owner in the provider block shouldn't need to repeat it in every github_organization data source. This is consistent with how other data sources in this provider handle the owner fallback.

Changes

• github/data_source_github_organization.go: changed name from Required to Optional+Computed, and fall back to meta.(*Owner).name when not supplied
• github/data_source_github_organization_test.go: added acceptance test verifying the fallback behaviour
• website/docs/d/organization.html.markdown: updated docs to reflect name is now optional, with a second example showing omitted name

Example

Before (name was required):

data "github_organization" "example" {
  name = "my-org"
}

After (name is falls back to provider owner):optional

provider "github" {
  owner = "my-org"
}

data "github_organization" "example" {}

Testing

All acceptance tests pass:

• uses_provider_owner_when_name_is_not_set (new)
• queries_for_an_organization_without_error
• queries_for_an_organization_with_archived_repos
• queries_for_an_organization_summary_only_without_error

[github-actions]

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