Refactor get_coredns_config (NE-2449): Use DynamicClient & testify/suite

[bentito]

This PR refactors the get_coredns_config tool introduced in #131 to align with the patterns established in #144.

Changes:

• Dynamic Client: Switched from controller-runtime client to DynamicClient for consistency with inspect_route.
• Test Suite: Migrated tests to testify/suite for better grouping and setup logic.
• New Test Suite: Created pkg/toolsets/netedge/suite_test.go to house the shared NetEdgeTestSuite.

This addresses feedback from @matzew regarding test grouping and client usage.

Related PRs:

• NE-2449: add netedge tool and get_coredns_config #131 (Introduced get_coredns_config)
• NE-2448: Add get_service_endpoints tool for NIDS troubleshooting #144 (Pattern for DynamicClient and testify/suite)

[openshift-ci]

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