Implement OCP cluster cleanup using openshift-install

[jyejare]

Summary

Implements full OCP cluster cleanup on AWS using the openshift-install CLI, superseding #166. This builds on the work from PR #166 by @oharan2, incorporating all review feedback.

• LeftoverAWSOcp class to model cluster resources, extract metadata from AWS resource tags (clusterName, clusterID, infraID), and build the metadata.json required by openshift-install
• Cleanup flow: discovers OCP-tagged resources via AWS Resource Explorer, groups by cluster infra ID, filters by SLA and exceptions, then runs openshift-install destroy cluster for each deletable cluster
• Exceptions support via OCPS: [] in aws.yaml config (consistent with VM/Stack exception patterns) instead of interactive --yes prompts
• Utility functions: check_installer_exists(), destroy_ocp_cluster(), write_metadata_file() with proper docstrings, pathlib usage, and specific exception handling
• Refactored filter_resources_by_time_modified → are_resources_older_than (returns bool, integrates time threshold calculation)
• Dockerfile.dev updated to install openshift-install CLI under /usr/local/bin/
• Removed dead code (delete_ocp stub, duplicated group_ocps_by_cluster from utils)
• Moved OCP_TAG_SUBSTR and related tag constants to constants.py

Review feedback addressed from #166:

• No --yes CLI flag — uses standard exceptions config instead (per @jyejare feedback on automated cleanup)
• self._delete naming for consistency with other cleanup classes
• Clusters kept inside the _delete dict structure for future dry-data standardization
• Function renamed to match its boolean return semantics
• pathlib.Path used for file operations
• Docstrings added to all new functions

Supersedes #166

Test plan

• Run swach -d aws --ocps in dry mode to verify resource discovery and filtering
• Verify OCP cluster exceptions are respected via OCPS: [] in config
• Run non-dry swach aws --ocps with openshift-install available to confirm cluster destruction
• Verify multi-region scanning works correctly
• Build Docker image from Dockerfile.dev to confirm openshift-install is available

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