feat: add yaml processor to create/delete resources from yaml manifest files

[kocarba]

• Implement delete_from_yaml functionality
• Combine create_from_yaml and delete_from_yaml into yaml_processor, preserving existing signatures for create
  (original PR Delete kubernetes resources from yaml files , solves #940 #1392 by @DiptoChakrabarty)

What type of PR is this?

/kind feature

What this PR does / why we need it:

The kubernetes python client has the ability to create resources from yaml files but lacks the ability to delete resources from yaml files. A delete action is provided to delete kubernetes resources in addition to the existing create.

This closes a long standing feature request in #940, and refactors the existing logic into a combined internal module while preserving backwards compatibility for existing users.

Which issue(s) this PR fixes:

Fixes #940

Special notes for your reviewer:

• Original implementation started in PR Delete kubernetes resources from yaml files , solves #940 #1392 by @DiptoChakrabarty
• This PR revives and modernizes that work, rebased on latest master
• All relevant tests pass locally; 4 unrelated (outside of scope of change) test failures/errors occur before and after changes

Does this PR introduce a user-facing change?

Added the ability to choose to create or delete resources from yaml manifest files.
Refactored into a new internal `yaml_processor` module (backwards-compatible).

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: kocarba
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• ✅ login: kocarba (b18352f)

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[roycaihw]

/assign @yliaog