fix: extend library condition resources to 7-level nesting

[ChristopherJHart]

Summary

• Extend ise_network_access_condition resource block from 2 to 7 levels of children nesting
• Extend ise_device_admin_condition resource block from 2 to 7 levels of children nesting

PR #41 extended inline policy set/rule condition nesting to 7 levels but did not update the library condition resource blocks (ise_network_access_condition, ise_device_admin_condition). These blocks remained at 2 levels of nesting (c → c2), preventing deeply nested reusable/library conditions from being propagated to ISE.

This PR extends both resource blocks to support 7 levels (c → c2 → c3 → c4 → c5 → c6), matching the inline condition depth.

Related Issues/PRs

• Fixes netascode/nac-ise#34
• Complements ConditionAndBlock/ConditionOrBlock Not Allowed in Deeply Nested Policy Conditions in Terraform Module #41 (inline policy condition nesting)
• Requires [Bug] ConditionAndBlock/ConditionOrBlock Not Allowed in Deeply Nested Policy Conditions in Terraform Provider CiscoDevNet/terraform-provider-ise#169 (provider-level deep nesting support)

Test plan

• Validate Terraform plan succeeds with library conditions containing 3+ levels of nesting
• Verify terraform apply creates deeply nested library conditions on ISE 3.4+
• Confirm no regression for existing 2-level library conditions

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🤖 AI Generation Metadata

• AI Generated: Yes
• AI Tool: claude-code
• AI Model: opus-4.6
• AI Contribution: ~100%
• AI Reason: extend library condition nesting to 7 levels
• Human Oversight: Code reviewed and approved by user

🤖 Generated with Claude Code