chore: add cleanup scan script for finding dangling / old resources

[jon-funk]

Description

Adds a script that can be used to find dangling resources in a given namespace. After we've done a few rounds of cleaning it'd be good to place this into CICD as a scheduled check.

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• Script accurately finds dangling resources and allows skipping based on a regex

Checklist

• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

Further comments

NOTE: I'm running cleanup after demos are all done, here's a sample run of what it's finding:

jon-funk@Atlas:~/projects/nr-compliance-enforcement/.github/scripts$ ALLOW_EXPR="object-store" SKIP_AUTH=true ./cleanup_scan.sh 
ALLOW_EXPR: object-store
Scanning for workloads older than 30 days in the targeted namespace
...
Found 15 workloads older than 30 days in the targeted namespace


Scanning for dangling secrets not used by workloads
...
Found 57 dangling secrets older than 30 days in the targeted namespace


Scanning for dangling pvcs not used by workloads
...
Found no stale and dangling PVCs in the targeted namespace


Scanning for dangling configmaps not used by workloads
...
Found 8 dangling configmaps older than 30 days in the targeted namespace


To delete these found workloads, locally run the following to see them:
Note: skip flag uses your existing oc authentication

SKIP_AUTH=true ./.github/scripts/cleanup_scan.sh
cat /tmp/old_workloads_to_delete.txt && cat /tmp/secrets_to_delete.txt && cat /tmp/pvcs_to_delete.txt && cat /tmp/configmaps_to_delete.txt

---

Thanks for the PR!

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[jon-funk]

See JIRA ticket CE-972 for deletion details

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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