Remove csi-driver-spiffe approver

[inteon]

The approver checked that the requestor matches the identity in the certificate.
However, if we take into account the correctness of the csi-driver-spiffe and the privileges required to create a CertificateRequest resource, this approver becomes less valuable.
Additionally, removing the approver greatly simplifies the installation process.
By reducing the steps required to get this CSI driver working, we aim to improve adoption rates of this CSI driver.

TODO: change the CSI driver so that the CRs are requested by the CSI's SA and not the pod's SA to prevent pods from requesting a random CertificateRequest (eg. for another pod).

[jetstack-bot]

Skipping CI for Draft Pull Request.
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You can still manually trigger a test run with /test all

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• 97b23cd Remove csi-driver-spiffe approver.

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[jetstack-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[jetstack-bot]

PR needs rebase.

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