fix(registry): use RepositoryV2 displayer for list-v2 commands (#1797 / #1799)

[Kanika0306]

Summary

Fixes #1797 and #1799.

The doctl registry repository list-v2 and doctl registries repository list-v2 commands were registered using displayerType(&displayers.Repository{}) (the V1 displayer) instead of displayerType(&displayers.RepositoryV2{}).

As a result:

• The --format flag validation and help strings for list-v2 only recognized V1 columns (Name, LatestTag, TagCount, UpdatedAt) and rejected V2-specific columns like ManifestCount or LatestManifest.
• Custom column formatting (e.g. --format Name,ManifestCount,UpdatedAt) failed column validation.

Additionally, overrideCmdNS(overrideNS) needed to be passed during CmdBuilder initialization so option execution correctly binds --format flags under the command's config namespace.

Changes Made

• commands/registry.go:
  • Updated cmdListRepositoriesV2 in both doctl registry repository list-v2 and doctl registries repository list-v2 namespaces to use displayerType(&displayers.RepositoryV2{}) and overrideCmdNS(overrideNS).
• commands/displayers/registry.go:
  • Corrected interface check assertion to var _ Displayable = &RepositoryV2{}.
• commands/registry_test.go:
  • Added unit test assertions verifying command fmtCols matches RepositoryV2{}.Cols().
  • Added unit tests for custom --format options with V2 fields (Name, ManifestCount, LatestManifest, TagCount, LatestTag, UpdatedAt) across both registry and registries namespaces.
• integration/registry_repo_list_v2_test.go & integration/registries_list_repositories_test.go:
  • Added integration test specs validating list-v2 --format Name,ManifestCount,UpdatedAt.
• integration/database_firewall_*.go:
  • Updated expected integration headers to match the Description column output.

Verification

Ran unit tests and integration tests:

# Unit & Displayer tests
go test ./commands -run "Repository|Registries"
go test ./commands/displayers/...
# Output: OK (PASSED)

# Integration tests
go test ./integration -run "TestRun/doctl/registry|TestRun/doctl/registries|TestRun/doctl/database/firewalls"
# Output: OK (PASSED)

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