add crossplane removal mode

[piotr-kotara-ibm]

Description of your changes

Fixes #

I have:

• Read and followed Crossplane's contribution process.
• Run make reviewable to ensure this PR is ready for review.
• Added backport release-x.y labels to auto-backport this PR if necessary.

if the new changes require, also:

• Extended the tests in BedrockShim repo or created an issue for it.
  These tests should cover for example checking new expected resources or their content.

How has this code been tested

[ibm-ci-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[pgodowski]

Two things:

• typo in the name
• gracfullyDelete implies we will delate all crossplane, while this flag only removed finalizers. Perhaps the name shall be a bit more specific?