Use ECDSA P-256 private keys for cert-manager certificates

[fmount]

Switch all cert-manager Certificate resources from the default RSA algorithm to ECDSA P-256. This applies to webhook serving certs, metrics server certs, and all operator bindata certificates. The sync-bindata.sh script is updated accordingly (and it properly regenerates all the services files).

Jira: https://redhat.atlassian.net/browse/OSPRH-27314

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[github-actions]

OpenStackControlPlane CRD Size Report

Metric	Value
CRD JSON size	350002 bytes (342KB)
Base branch size	350002 bytes
Change	+0.00%
Status	yellow — growing

Threshold reference

Color	Range	Meaning
🟢 green	< 300KB	Comfortable
🟡 yellow	300–400KB	Growing
🟠 orange	400–750KB	Concerning
🔴 red	> 750KB	Approaching 1.5MB etcd limit (cut in half to allow space for update)

[centosinfra-prod-github-app]

Build failed (check pipeline). Post recheck (without leading slash)
to rerun all jobs. Make sure the failure cause has been resolved before
you rerun jobs.

https://gateway-cloud-softwarefactory.apps.ocp.cloud.ci.centos.org/zuul/t/rdoproject.org/buildset/d91800d9b448468ca01c8104cce1d670

❌ openstack-k8s-operators-content-provider FAILURE in 4m 01s
⚠️ podified-multinode-edpm-deployment-crc SKIPPED Skipped due to failed job openstack-k8s-operators-content-provider
⚠️ cifmw-crc-podified-edpm-baremetal SKIPPED Skipped due to failed job openstack-k8s-operators-content-provider
⚠️ openstack-operator-tempest-multinode SKIPPED Skipped due to failed job openstack-k8s-operators-content-provider
⚠️ openstack-operator-edpm-baremetal-minor-update SKIPPED Skipped due to failed job openstack-k8s-operators-content-provider

[openshift-ci]

@fmount: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/openstack-operator-build-deploy-kuttl-4-18	62715b2	link	true	/test openstack-operator-build-deploy-kuttl-4-18

Full PR test history. Your PR dashboard.

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